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• Synaptics error "no touchpad found" at startup on HP laptop

  - by Sandra

  I know there are a lot of topics on the synaptics touchpad not working, but I can't seem to find the answer to my problem anywhere. Please forgive me if I missed it. Here is what happened. After using the "ambient light" F11 key on my HP laptop (Compaq nc8430), the touchpad was disabled and I couldn't get it to work. Then I found this thread : "Synaptic touchpad on laptop not working". And Salem's answer totally solved my problem, both for the session fix and for the permanent fix. But since then, after each reboot I get the same error pop-up, with the following content: No touchpad found. No touchpad was found in this system. If the system has a touchpad, please make sure that the synaptics driver is properly installed and configured. If your touchpad is not found, though the driver is installed and configured correctly, please compile detailed information about your touchpad hardware and report this issue to the issue tracker. Needless to say, the driver is indeed installed, activated and configured (even though it's kind of useless now, since I guess the .conf file I created is doing all the work). I know it's a minor issue, because the touchpad does work properly, but it's getting really annoying... So, could anyone please help me fix this error pop-up problem ? Thank you !

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• Apache Not Accepting a Path in My Home Folder

  - by Promather

  I have trying to set up an Apache site to use a folder in my home folder without any success. I exactly followed the steps in this page: https://help.ubuntu.com/community/ApacheMySQLPHP yet I did not succeed; I keep getting error 403, which says that the server doesn't have permission to access the requested page. I searched forums and many suggested changing the permission of the folder. I went straight away and set the permission to 777, but that didn't solve the problem. I made another search and somebody gave me a clue, which is that it could be because my home folder is encrypted. I believe this could be the problem, but: What is the relation between encryption and Apache? I suppose Apache server is requesting the file from the system, rather than trying to access the file bytes! Is there anyway to solve this problem? I don't want to move the folder to /var/www because I am using this Apache for testing, so I want whatever change I make to be immediately reflected, rather than having to copy files which is error prone.

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• Facebook and flash - why doesn't facebook recognise that I have flash installed?

  - by jaminday

  For some reason when I try to upload photos to facebook from the website, it tells me I need to upgrade my flash player: I definitely have flash installed, as can be seen in the picture, and working fine in youtube etc. My question is two-fold: 1) Does anyone know if this a problem with the version of flash I'm running, Ubuntu, or facebook itself? I get the same problem in Chrome and Firefox, so I know it's not the browser. 2) Is there a workaround or fix for this? As far as I can tell I'm running the very latest flash (on 64-bit Ubuntu 10.10) - but maybe that's the problem? Note: Before everyone starts jumping up and down about using Shotwell or Digikam or some such to upload photos to facebook, I know about these (and do use Shotwell at times). Unfortunately Shotwell only lets you upload to a Profile, but doesn't (as far as I can tell) let you upload to a facebook Page of which I am an administrator, so I am forced do it through the website. Using the simple uploader as seen in the first picture is horribly slow and tedious, and often times out while uploading. Of course if anyone knows of any alternate ways to upload to facebook pages I'd love to hear 'em!

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• How can I better implement A star algorithm with a very large set of nodes?

  - by Stephen

  I'm making a game with nodejs in which many enemies must converge on the player as the player moves around a relatively open space (right now it is an open field with few obstacles, but eventually there may be some small buildings in the field with 1 or 2 rooms). It's a multiplayer game using websockets, so the server needs to keep track of enemies and players. I found this javascript A* library which I've modified to be used on the server as a nodejs module. The library utilizes a Binary Heap to track the nodes for the algorithm, so it should be pretty fast (and indeed, with a small grid, say 100x100 it is lightning fast). The problem is that my game is not really tile-based. As the player moves around the map, he is moving on a more or less 1-to-1 per-pixel coordinate system (the player can move in 8 directions, 1 or 2 pixels at a time). In preliminary tests, on an 800x600 field, the path-finding can take anywhere from 400 to 1000 ms. Multiply that by 10 enemies and the game starts to get pretty choppy. I have already set it up so that each enemy will only do a path-finding call once per second or even as slow as once every 2 seconds (they have to keep updating their path because the players can move freely). But even with this long interval, there are noticeable lag spikes or chops every couple of seconds as the enemies update their paths. I'm willing to approach the problem of path-finding differently, if there's another option. I'm assuming that the real problem is the enormous grid (800x600). It also occurs to me that maybe the large arrays are to blame, as I've read that V8 has trouble with large arrays.

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• Since a few days, Dropbox stopped syncing

  - by Fabio

  Theres a new problem with nautilus-dropbox and is the worst for a service like Dropbox: stopped syncing and their tech support don't believe their users. The problem is: start dropbox it downloads index creates folders start to download files stop downloading files or the speed is like 0.3k/seg even deleting everything doesn't work, even syncing a single folder with a few files, not even configuring a different limit speed or let all your bandwith, nothing works for me and i have found many users with the same problem. it's strange, i have two computers with ubuntu 14.04 and one with windows 7, and in one of the linux machines it works fine, but not in the other one. Both of them are x64. The answers from the tech support starts with "delete everything and reinstall" to "you may be blocking port 443", yeah, sure (and if i do that half of internet dissapears, idiot), but nothing works. Someone has some idea? i cant find any log file (at least a text log file like in /var/log) to understand what is dropbox doing and what is not working. PS: sorry for my "english", is not my language Examples: dropbox slow on ubuntu 14.04 Dropbox does not sync on ubuntu 14.04 Dropbox Status (in spanish but is the same thing) fabio@canopus:~$ dropbox status Sincronizando (Quedan 330 archivos., Faltan 9 días.) Descargando 330 archivos... (0,3 KB/s, Faltan 9 días.) 9 days for 330 files / 100Mb

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• Is my use case diagram correct?

  - by Dummy Derp

  NOTE: I am self studying UML so I have nobody to verify my diagrams and hence I am posting here, so please bear with me. This is the problem I got from some PDF available on Google that simply had the following problem statement: Problem Statement: A library contains books and journals. The task is to develop a computer system for borrowing books. In order to borrow a book the borrower must be a member of the library. There is a limit on the number of books that can be borrowed by each member of the library. The library may have several copies of a given book. It is possible to reserve a book. Some books are for short term loans only. Other books may be borrowed for 3 weeks. Users can extend the loans. 1. Draw a use case diagram for a library. 2. Give a use case description for two use cases: • Borrow copy of book • Extend loan Diagram: Use case description: 1. Borrow a copy of the book: If the person wishes to borrow a book from Derpville Public Library, he/she must be a member of the library in which case they will be allowed to issue a certain number of books. If the person is not a member, the book will not be issued to them for taking away, rather they will have to sit and read in the library. 2. Extending loan: Some books will be lent for 3 weeks while others will be lent for more than 3 weeks in which case the person borrowing has to come to the library and get the date extended. There is a limit on how much the user can extend the date of a particular book.

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• Missing /dev/xconsole causes rsyslog to stop as well as all other services

  - by George Van Tuyl

  We are running Ubuntu-10.04.04LTS in Hyper-V environments. We found that the services ssh http or anything else stopped because the rsyslog daemon had died with the message unable to find the /dev/xconsole file. I fixed it temporarily with the following. FILE=/dev/xconsole if [ -e $FILE ]; then echo "$FILE exists Carry on!" else mknod -m 640 /dev/xconsole c 1 3 chown syslog:adm /dev/xconsole echo "Created $FILE." fi The problem is that I can not get rsyslog daemon to process these 8 lines when I restart the daemon. Also restarting the daemon removes the /dev/xconsole file and we are back to all service stopped. In addressing this problem I have inserted the if--fi lines after the start and restart conditions in the rsyslog script. The problem is I do not get an echo to stdio. Does someone have an idea on how to make the rsyslog report to stdio when it creates the /dev/xconsole device. Thanks George Van Tuyl

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• Huawei E3276 LTE uplink slow in the routing Ubuntu, but not with other devices in the LAN

  - by Mytomi

  I have a Huawei E3276 LTE dongle (12d1:14fe - 12d1:1506) and a problem with the upstream speed. The problem is not only present with Ubuntu 14.04 LTS (64 bit workstation, kernel 3.16), but also with Raspbian Jessie for Raspberry PI (kernel 3.14). Upstream seems to be always limited to 5 Mbit/s whenever I check the speed from the Linux computer that I use as a LTE router. The other computers in the LAN always get about 10-15 Mbit/s upstream, even though the traffic is routed through the same Linux computer suffering from seemingly capped uplink. Downstream speed is always fine, 25 Mbit/s. I even installed Windows 7 in the same computer as Ubuntu and the speeds are 25 Mbit/s down, 15 Mbit/s up. So the problem is not with E3276 device itself or in the mobile subscription, but in the Huawei E3276 Linux compatibility. Maybe something in the kernel? I have made sure that the matter is not with iptables rules: the speed does not noticeably increase when iptables is disabled. Turning off IPv4 forwarding does not improve speed either. I'm not sure what settings and logs do help in debugging the situation. Please ask for more details, if you have a clue what might be wrong. Thanks, Mytomi

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• Websockets through Stunnel is giving random bytes.

  - by user16682

  I have several servers set up for a web application that I am developing. One is a load balancing server, and I'm running a php WebSockets server on this balancer. The website that I am developing on uses ssl, so I have my WebSockets running through a wss uri connecting directly to the balancer, where I have set up stunnel4 to decrypt all traffic at a certain port and re-rout it to my php WebSockets server. This works fine when it comes down to connecting to my server. That's not the problem. The problem occurs when I try to send data to the server. Occasionally when I try this, stunnel does not appear to be decrypting the data properly. I get garbage characters in my termanal running the server: what appear to be completely random bytes. This can sometimes go on for several consecutive messages that I send before abruptly working again. It is very erratic and unpredictable. Sometimes I refresh the page, and all the messages work perfectly. Sometimes the WebSocket connects and I have to wait 5-10 seconds before any messages I send are interpreted properly by the server. Other times I can't send any messages at all, because they all end up as garbage. I believe this is a stunnel problem, but I am not certain. Does anybody have any experience with this? I would like a more predictable server if I can get it. Some more information: This occurs extensively in Chrome, not quite as much in FireFox, and never in Safari. The php server I am using is phpws http://code.google.com/p/phpws/ -- On the WebSocket connection, this server would sometimes detect that the header was only 1 byte in size, the first byte of the WebSockets header. I had to modify the server to flush the buffer ever time this occurred so that it would reliably connect.

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• How can we make agile enjoyable for developers that like to personally, independently own large chunks from start to finish

  - by Kris

  We’re roughly midway through our transition from waterfall to agile using scrum; we’ve changed from large teams in technology/discipline silos to smaller cross-functional teams. As expected, the change to agile doesn’t suit everyone. There are a handful of developers that are having a difficult time adjusting to agile. I really want to keep them engaged and challenged, and ultimately enjoying coming to work each day. These are smart, happy, motivated people that I respect on both a personal and a professional level. The basic issue is this: Some developers are primarily motivated by the joy of taking a piece of difficult work, thinking through a design, thinking through potential issues, then solving the problem piece by piece, with only minimal interaction with others, over an extended period of time. They generally complete work to a high level of quality and in a timely way; their work is maintainable and fits with the overall architecture. Transitioning to a cross-functional team that values interaction and shared responsibility for work, and delivery of working functionality within shorter intervals, the teams evolve such that the entire team knocks that difficult problem over. Many people find this to be a positive change; someone that loves to take a problem and own it independently from start to finish loses the opportunity for work like that. This is not an issue with people being open to change. Certainly we’ve seen a few people that don’t like change, but in the cases I’m concerned about, the individuals are good performers, genuinely open to change, they make an effort, they see how the rest of the team is changing and they want to fit in. It’s not a case of someone being difficult or obstructionist, or wanting to hoard the juiciest work. They just don’t find joy in work like they used to. I’m sure we can’t be the only place that hasn’t bumped up on this. How have others approached this? If you’re a developer that is motivated by personally owning a big chunk of work from end to end, and you’ve adjusted to a different way of working, what did it for you?

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• JRockit R28 "Ropsten" released

  - by tomas.nilsson

  R28 is a major release (as indicated by the careless omissions of "minor" and "revision" numbers. The formal name would be R28.0.0). Our customers expect grand new features and innovation from major releases, and "Ropsten" will not disappoint. One of the biggest challenges for IT systems is after the fact diagnostics. That is - Once something has gone wrong, the act of trying to figure out why it went wrong. Monitoring a system and keeping track of system health once it is running is considered a hard problem (one that we to some extent help our customers solve already with JRockit Mission Control), but doing it after something occurred is close to impossible. The most common solution is to set up heavy logging (and sacrificing system performance to do the logging) and hope that the problem occurs again. No one really thinks that this is a good solution, but it's the best there is. Until now. Inspired by the "Black box" in airplanes, JRockit R28 introduces the Flight Recorder. Flight Recorder can be seen as an extremely detailed log, but one that is always on and that comes without a cost to system performance. With JRockit Flight Recorder the customer will be able to get diagnostics information about what happened _before_ a problem occurred, instead of trying to guess by looking at the fallout. Keywords that are important to the customer are: • Extremely detailed, always on, diagnostics information • No performance overhead • Powerful tooling to visualize the data recorded. • Enables diagnostics of bugs and SLA breaches after the fact. For followers of JRockit, other additions are: • New JMX agent that allows JRMC to be used through firewalls more easily • Option to generate HPROF dumps, compatible with tools like Eclipse MAT • Up to 64 BG compressed references (previously 4) • View memory allocation on a thread level (as an Mbean and in Mission Control) • Native memory tracking (Command line and Mbean) • More robust optimizer. • Dropping support for Java 1.4.2 and Itanium If you have any further questions, please email [email protected]. The release can be downloaded from http://www.oracle.com/technology/software/products/jrockit/index.html

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• Can AJAX in a CMS slow down your server

  - by Saif Bechan

  I am currently developing some plugins for WordPress, and I was wondering which route to take. Let's take an example, you want to display the last 3 tweets on your page. Option 1 You do things the normal way inside WordPress. Someone enters the website, while generating the page, you fetch the tweets in php via the twitter api, and just display them where you want. Now the small problem with this is, that you have to wait for the response from twitter. This takes a few ms. NO real problem, but this is question is just out of curiosity. Option 2 Here you don't do anything in WordPress on the initial load, but you do have the API inside. Now you just generate the page, and as soon as the page is done on the client side, you do a small AJAX call back to the server via a WordPress plugin, to fetch your latest tweets. Also called asynchronously. Now the problem with this IMO is that you have much more stress on your server. For starters you have two HTTP requests instead of one. Secondly the WordPress core has to load two times instead of one. Other options Now I know there are a lot of other options: 1) Getting the tweets directly via javascript, no stress on the server at all. 2) Cache the tweets so they are fetched from the DB instead of using the API every time. 3) Getting the tweets from an ajax call that is not a WordPress plugin. 4) Many more. My Question Now my question is if you only compare 1 and 2, which would be a better choice.

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• Entity Framework with large systems - how to divide models?

  - by jkohlhepp

  I'm working with a SQL Server database with 1000+ tables, another few hundred views, and several thousand stored procedures. We are looking to start using Entity Framework for our newer projects, and we are working on our strategy for doing so. The thing I'm hung up on is how best to split the tables into different models (EDMX or DbContext if we go code first). I can think of a few strategies right off the bat: Split by schema We have our tables split across probably a dozen schemas. We could do one model per schema. This isn't perfect, though, because dbo still ends up being very large, with 500+ tables / views. Another problem is that certain units of work will end up having to do transactions that span multiple models, which adds to complexity, although I assume EF makes this fairly straightforward. Split by intent Instead of worrying about schemas, split the models by intent. So we'll have different models for each application, or project, or module, or screen, depending on how granular we want to get. The problem I see with this is that there are certain tables that inevitably have to be used in every case, such as User or AuditHistory. Do we add those to every model (violates DRY I think), or are those in a separate model that is used by every project? Don't split at all - one giant model This is obviously simple from a development perspective but from my research and my intuition this seems like it could perform terribly, both at design time, compile time, and possibly run time. What is the best practice for using EF against such a large database? Specifically what strategies do people use in designing models against this volume of DB objects? Are there options that I'm not thinking of that work better than what I have above? Also, is this a problem in other ORMs such as NHibernate? If so have they come up with any better solutions than EF?

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• OS X Mavericks Won't Connect To Ubuntu Server (Netatalk, Avahi)

  - by Andy Ibanez

  I'm really sorry for posting this. I know it may have been asked a thousand times. I have googled like crazy and I'm on the verge of desperation here. Basically, I followed this guide: http://motionsoundfx.com/2012/05/ubuntu-vnc-afp-macosx/ To create a small personal file server. When I installed it, I was able to connect to it just fine, I connected with my Ubuntu username and password and I was able to see the home directory. But later, I had to restart the file server so I could prepare a couple of other hard drives to put in. When the server restarted, I tried to connect to it, but I got an error message on my Mac: "The version of the server you're trying to connect to is not supported. Please contact your system administrator to solve this problem." Again, I have googled like crazy for this, and everybody says it is a problem with OS X Lion and up (assuming it affects Mavericks too). I have tried all the fixes mentioned for Lion and Mountain Lion and I haven't had any luck. That's the reason I'm posting this here: I suspect the problem is with my Ubuntu server. This happened after I restarted the server. Before restarting the server, I just put in my credentials and saw my home directory. Something when I restarted the server must have been messed up. I have found some other solutions, including to use "SHX2" in the conf file, but it hasn't worked for me. I ask for your help to solve this issue. Also please understand I'm completely illiterate when it comes to Linux. This is a nice chance to me to learn the OS so please give me detailed steps to do things if you deem it necessary. Thank you! I'm using Ubuntu Server 13.10 (the latest one as of today).

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• Embedded .swf file in .pfd-Ubuntu 10.04

  - by Thanos

  I have just finished a presentation in LaTeX. In this very .pdf file I have included a .swf animation(done with adobe flash CS5 in windows) which starts when you click on it. While I have already installed a relevant player(swfdec flash player) neither document viewer nor okular are able to reproduce it. I tried with my player to make sure that the file is not corrupted and the result was that it can be produced. I tried the same .pdf file in windows using adobe reader and there is no problem there. The embedded file can be reproduced with no problem. So I thought of installing adobe in ubuntu. I tried there to see if the problem was solved. Things got a bit better. Adobe could understand that there is something there, so when clicked I got a message that I had to get the proper player. When I clicked on a relevant button I expected to open my browser in a player's page. Instead nothing happened. If I place my mouse's cursor next to the space that defines my animation the is a "message" stating "Media File(application/x-shockwave flash)". The next step was to install Adobe Flash player, but I couldn't find the standallone player;only the browser's plugs... How can I get this .swf file play in pdf?

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• Entity component system -> handling components that depend on one another

  - by jtedit

  I really like the idea of an entity component system and feel it has great flexibility, but have a question. How should dependent components be handled? I'm not talking about how components should communicate with other components they depend on, I have that sorted, but rather how to ensure components are present. For example, an entity cannot have a "velocity" component if it doesn't have a "position" component, in the same way it cant have an "acceleration" component if it doesn't have a "velocity" component. My first idea was every component class overrides an "onAddedToEntity(Entity ent)" function. Then in that function it checks that prerequisite components are also added to the entity, eg: struct EntCompVelocity() : public EntityComponent{ //member variables here void onAddedToEntity(Entity ent){ if(!ent.hasComponent(EntCompPosition::Id)){ ent.addComponent(new EntCompPosition()); } } } This has the nice property that if the acceleration component adds the velocity component, the velocity component will itself add the position component to the entity so dependency "trees" will sort themselves out. However my concern is if I do this components will silently be added with default values and, in the example of adding position, many entities will appear at the origin. Another idea was to simple have the "Entity.addComponent();" function return false if the component's prerequisite components aren't already on the entity, this would force you to manually add the position component and set its value before adding the velocity component. Finally I could simply not ensure a components prerequisite components are added, the "UpdatePosition" system only deals with entities with both a position and velocity component, so therefore adding a velocity component without having a position component wont be a problem (it wont cause crashes due to null pointer/etc), but it does mean entities will carry useless unused data if you add components but not their prerequisite components. Does anyone have experience with this problem and/or any of these methods to solve it? How did you solve the problem?

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• Fix Package is in a very bad inconsistent state

  - by Benjamin Piller

  I can't update my system because it freezes while installing a third-party update (zramswap-enabler)!! Sometimes I get the following message in Update manager: Could not initialize the package information An unresolvable problem occurred while initializing the package information. Please report this bug against the 'update-manager' package and include the following error message: E:The package zramswap-enabler needs to be reinstalled, but I can't find an archive for it. I tried to remove the zramswap-enabler, but it's impossible because I get the following message: dpkg: error processing zramswap-enabler (--remove): Package is in a very bad inconsistent state - you should reinstall it before attempting a removal. Errors were encountered while processing: zramswap-enabler E: Sub-process /usr/bin/dpkg returned an error code (1) Actually i would really reinstall that package, but it is unable to do it! If i remove this third-party PPA then the system is warning me about a very very serious problem. So why can i not install/reinstall/remove/update this package and why freezes the updater if i try to update? -S O L U T I O N-: Okay! Finally i found the solution for this Problem! Step 1. Make sure that your PPA is correctly Step 2. Remove the broken package via the following command: sudo dpkg --remove --force-remove-reinstreq zramswap-enabler Step 3. install the package again (sudo apt-get install zramswap-enabler) Step 4. After restart (not necessary) you are able to install the updates correctly! Actually you can fix any "Package is in a very bad inconsistent state” Issues with this solution!!!

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• How to fix sudo: setreuid(ROOT_UID, user_uid): Operation not permitted error?

  - by David R.

  I am using LDAP authentication on my Ubuntu 11.10 server. I installed libpam-ldap, and configured things accordingly. It works great, except that I get this error every once in a while when I try to sudo: sudo: setreuid(ROOT_UID, user_uid): Operation not permitted I know I have sudoers set up correctly, since it works most of the time. It's not just my log in either, others have the same problem when I have it. When this error is occurring, I can't ssh in with my regular system user at all. When I sign in directly, I can't get any gnome-terminal to start. Once I restart the server, the problem goes away. 'Course, that's not a solution, if it was a prod server, I'd be in trouble. How do I fix this? Edit 3/1/12: I just figured out that if stop and start the nscd service, the problem goes away. service nscd stop service nscd start Not much of a solution since I have to be logged into the server directly, not via ssh.

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• How can we plan projects realistically while accounting for support issues?

  - by Thomas Clayson

  We're having a problem at work: we're trying to schedule work so that we can assess time scales and get deadline dates. The problem is that it's difficult to plan for a project without knowing everything that's going to happen. For instance, right now we've planned all our projects through the start of December, however in that time we will have various in house and external meetings, teleconferences and extra work. It's all well and good to say that a project will take three weeks, but if there is a week's worth of interruption in that time then the date of completion will be pushed back a week. The problem is 3 fold: When we schedule projects the time scales are taken literally. If we estimate three weeks, the deadline is set for three week's time, the client is told, and there is no room for extension. Interim work and such means that we lose productive time working on the project. Sometimes clients don't have the time that we need to take to do the work, so they'll sometimes come to us and say they need a project done by the end of the month even when we think that the work will take two months - not to mention we already have work to be doing. We have a Gantt chart which we are trying to fill in with all the projects we have and we fill in timesheets, but they're not compared to the Gantt chart at all. This makes it difficult to say "Well, we scheduled 3 weeks for this project, but we've lost a week here so the deadline has to move back a week." It's also not professional to keep missing deadlines we've communicated to the client. How do other people deal with this type of situation? How do you manage the planning of projects? How much "extra" time do you schedule into a project to account for non-project work that occurs during a project? How do you deal with support issues and bugs and stuff? Things you can't account for during planning? UPDATE Lots of good answers thank you.

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• How to avoid big and clumpsy UITableViewController on iOS?

  - by Johan Karlsson

  I have a problem when implementing the MVC-pattern on iOS. I have searched the Internet but seems not to find any nice solution to this problem. Many UITableViewController implementations seems to be rather big. Most example I have seen lets the UITableViewController implement UITableViewDelegate and UITableViewDataSource. These implementations are a big reason why UITableViewControlleris getting big. One solution would be to create separate classes that implements UITableViewDelegate and UITableViewDataSource. Of course these classes would have to have a reference to the UITableViewController. Are there any drawbacks using this solution? In general I think you should delegate the functionality to other "Helper" classes or similar, using the delegate pattern. Are there any well established ways of solving this problem? I do not want the model to contain to much functionality, nor the view. A believe that the logic should really be in the controller class, since this is one of the cornerstones of the MVC-pattern. But the big question is; How should you divide the controller of a MVC-implementation into smaller manageable pieces? (Applies to MVC in iOS in this case) There might be a general pattern for solving this, although I am specifically looking for a solution for iOS. Please give an example of a good pattern for solving this issue. Also an argument why this solution is awesome.

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• How can we make agile enjoyable for developers that like to personally, independently own large chunks from start to finish

  - by Kris

  We’re roughly midway through our transition from waterfall to agile using scrum; we’ve changed from large teams in technology/discipline silos to smaller cross-functional teams. As expected, the change to agile doesn’t suit everyone. There are a handful of developers that are having a difficult time adjusting to agile. I really want to keep them engaged and challenged, and ultimately enjoying coming to work each day. These are smart, happy, motivated people that I respect on both a personal and a professional level. The basic issue is this: Some developers are primarily motivated by the joy of taking a piece of difficult work, thinking through a design, thinking through potential issues, then solving the problem piece by piece, with only minimal interaction with others, over an extended period of time. They generally complete work to a high level of quality and in a timely way; their work is maintainable and fits with the overall architecture. Transitioning to a cross-functional team that values interaction and shared responsibility for work, and delivery of working functionality within shorter intervals, the teams evolve such that the entire team knocks that difficult problem over. Many people find this to be a positive change; someone that loves to take a problem and own it independently from start to finish loses the opportunity for work like that. This is not an issue with people being open to change. Certainly we’ve seen a few people that don’t like change, but in the cases I’m concerned about, the individuals are good performers, genuinely open to change, they make an effort, they see how the rest of the team is changing and they want to fit in. It’s not a case of someone being difficult or obstructionist, or wanting to hoard the juiciest work. They just don’t find joy in work like they used to. I’m sure we can’t be the only place that hasn’t bumped up on this. How have others approached this? If you’re a developer that is motivated by personally owning a big chunk of work from end to end, and you’ve adjusted to a different way of working, what did it for you?

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• Ubuntu 12.04.1 Update Manager and synaptic Package Manager not working

  - by Ashoke

  Recently installed Ubuntu 12.04.1, 64bit on Intel Quad core system. There is a Red Circle with a WHITE 'minus' sign on the upper right hand corner. In the end of a long message displayed below the RED CIRCLE in 'grey' says that INSTALLED PACKAGES HAVE UNMET DEPENDENCIES. None of the following is working. 1. Ubuntu Software Center not opening. UPDATE MANAGER Could not initialize the package information An unresolvable problem occurred while initializing the package information. Please report this bug against the 'update-manager' package and include the following error message: 'E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/in.archive.ubuntu.com_ubuntu_dists_precise-updates_multiverse_binary-i386_Packages, E:The package lists or status file could not be parsed or opened.' SYNAPTIC PACKAGE MANAGER AN ERROR OCCURED The following details are provided E: Encountered a section with no Package: header E: Problem with MergeList /var/lib/apt/lists/in.archive.ubuntu.com_ubuntu_dists_precise-updates_multiverse_binary-i386_Packages E: The package lists or status file could not be parsed or opened. E: _cache-open() failed, please report. Otherwise, the computer is working fine with broadband WiFi internet. InstallPLEASE HELP.

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• Styles of games that work at low-resolution

  - by Brendan Long

  I'm taking a class on compilers, and the goal is to write a compiler for Meggy Jr devices (Arduino). The goal is just to make a simple compilers with loops and variables and stuff. Obviously, that's lame, so the "real goal" is to make an impressive game on the device. The problem is that it only has 64 pixels to work with (technically 72, but the top 8 are single-color and not part of the main display, so they're really only useful for displaying things like money). My problem is thinking of something to do on a device that small. It doesn't really matter if it's original, but it can't be something that's already available. My first idea was "snake", but that comes with the SDK. Same with a side-scrolling shooter. Remaining ideas include a tower defense game (hard to write, hard to control), an RPG (same), tetris (lame).. The problem is that all of the games I like require a high-resolution screen because they have a lot of text. Even a really simple game like nethack would be hard because each creature would be a single color. tl;dr What styles of games require a. No text; and b. Few enough objects that representing them each with a single color is acceptable? EDIT: To clarify, the display is 8x8 for a total of 64 pixels, not 64x64.

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• Iphone/Android app – chatroom development – what framework & hosting needs?

  - by MikaelW

  I have some experience regarding IPhone and Android development but I am now struggling to solve a new class of problem: apps that involve a client/server chatroom feature. That is, an app when people can exchange text over the internet, and without having the app to constantly “pull” content from the server. So that problem can’t be solved with a normal php/mysql website, there must be some kind of application running on a server that is able to send message from the server to the phone, rather than having the phone to check for new messages every 10 seconds… So I’m looking for ways to solve the different problems here: What framework should I use on the two sides (phone / server)? It should be some kind of library that doesn’t prevent me to write paid apps. It should also be possible to have the same server for the Iphone and android version of the app. What server / hosting solution do I need with what sort of features, I just have no experience regarding server application that can handle and initiate multiple connections and are hosted on hardware that is always online I tried to find resources online but couldn’t so far, either the libraries had the wrong kind of license/language or I just didn’t understand… Sometimes there were nice tutorial but for different needs such as peer2peer chat over local network… Same with the server and the hosting problem, not sure where to start really, I’m calling for help and I promise I will complete this page with notes about the experience I will get :-) Obviously the ideal would be to find a tutorial I missed that include client code, server code and a free scalable server… That being said, If I see something as good, it probably means that I have eaten the wrong kind of mushroom again… So, failing that, any pointer which might help me toward that quest, would be greatly appreciated. Thanks in advance. Mikael

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• Fastest way to group units that can see each other?

  - by mac

  In the 2D game I'm working with, the game engine is able to give me, for each unit, the list of other units that are in its view range. I would like to know if there is an established algorithm to sort the units in groups, where each group would be defined by all those units which are "connected" to each other (even through others). An example might help understand the question better (E=enemy, O=own unit). First the data that I would get from the game engine: E1 can see E2, E3, O5 E2 can see E1 E3 can see E1 E4 can see O5 E5 can see O2 E6 can see E7, O9, O1 E7 can see E6 O1 can see E6 O2 can see O5, E5 O5 can see E1, E4, O2 O9 can see E6 Then I should compute the groups as follow: G1 = E1, E2, E3, E4, E5, O2, O5 G2 = O1, O9, E6, E7 It can be safely assumed that there is a transitive property for the field of view: [if A sees B, then B sees A]. Just to clarify: I already wrote a naïve implementation that loops on each row of the game engine info, but from the look of it, it seems a problem general enough for it to have been studied in depth and have various established algorithms (maybe passing through some tree-like structure?). My problem is that I couldn't find a way to describe my problem that returned useful google hits. Thank you in advance for your help!

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