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Articles indexed in March 2012

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• In Scrum, should tasks such as development environment set-up and capability development be managed as subtasks within actual user stories?

  - by Asim Ghaffar

  Sometimes in projects we need to spend time on tasks such as: exploring alternate frameworks and tools learning the framework and tools selected for the project setting up the servers and project infrastructure (version control, build environments, databases, etc) If we are using User Stories, where should all this work go? One option is to make them all part of first user story (e.g. make the homepage for application). Another option is to do a spike for these tasks. A third option is to make task part of an Issue/Impediment (e.g. development environment not selected yet) rather than a user Story.

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• Exposing warnings\errors from data objects (that are also list returned)

  - by Oren Schwartz

  I'm exposing Data objects via service oriented assembly (which on future usages might become a WCF service). The data object is tree designed, as well as formed from allot of properties.Moreover, some services return one objects, others retrieve a list of them (thus disables throwing exceptions). I now want to expose data flow warnings and wondering what's the best way to do it having to things to consider: (1) seperation (2) ease of access. On the one hand, i want the UI team to be able to access a fields warnings (or errors) without having them mapping the field names to an external source but on the other hand, i don't want the warnings "hanged" on the object itself (as i don't see it a correct design). I tought of creating a new type of wrapper for each field, that'll expose events and they'll have to register the one's they care about (but totally not sure) I'll be happy to hear your thoughts. Could you please direct me to a respectful design pattern ? what dp will do best here ? Thank you very much!

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• What Are Some Advantages/Disadvantages of Using C over Assembly?

  - by Daniel

  I'm currently studying engineering in Telecommunications and Electronics and we have migrated from assembler to C in microprocessor programming. I have doubts that this is a good idea. What are some advantages and disadvantages of C compared to assembly? The advantages/disadvantages I see are: Advantages: I can tell that C syntax is a lot easier to learn than Assembler syntax. C is easier to use for making more complex programs. Learning C is somehow more productive than learning assembler cause there is more developing stuff around C than Assembler. Disadvantages: Assembler is a lower level programming language than C,so this makes it a good for programming directly to hardware. Is a lot more flexible alluding you to work with memory,interrupts,micro-registers,etc.

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• how do you remember programming related stuff?

  - by dan leadgy

  How do you remember programming related stuff? Did you get the feeling you did encounter the error you have now a few years ago and you could swear you knew the cause but now you forgot it? Did you work with the xsl's string parsing some time ago but now you can't remember exactly which are the string functions altogether from xsl and you have to start from scratch? Or perhaps you forget about some feature from Apache Commons like "filtering a collection by some predicate" that you surely used in the past. So how do you do it? I tried having a blog but when I develop apps, I never find the time to update the blog or write about my experiences. Also, using a wiki is a nice thing but then I found it difficult to keep a clean separation between them since many times I needed to change a blog post to add new information about that topic. This made me think that I actually should have put this topic in the wiki instead of the blog. Do you have any systems that help you remember about your programming experience? What's your setup?

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• Is it better to build HTML Code string on the server or on the client side?

  - by Ionut

  The result of the following process should be a html form. This form's structure varies from one to user. For example there might be a different number of rows or there may be the need for rowspan and colspan. When the user chooses to see this table an ajax call is made to the server where the structure of the table is decided from the database. Then I have to create the html code for the table structure which will be inserted in the DOM via JavaScript. The following problem comes to my mind: Where should I build the HTML code which will be inserted in the DOM? On the server side or should I send some parameters in the ajax call method and process the structure there? Therefore the main question involves good practice when it comes to decide between Server side processing or client side processing. Thank you!

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• Who are the outspoken critics of Object-Oriented design?

  - by Xepoch

  Sure, object-oriented techniques are great and have stuck around for a while. I know only less than a handful of critics of the OO principles. It seems as though most non-OO designs and architectures are shunned, yet we continue to write a lot of good software in C and solve a lot of data changes via awk/sed and countless other examples. Correct tool for the correct job, yes? I'm having a hard time finding articles, presentations, or published criticisms of OO (even Fred Brooks has blessed information hiding). Are there any well-known, published and/or outspoken critics of OO?

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• What is the best approach for database design with lots of columns?

  - by Pratyush

  I am writing a query based financial application. It lets the user to write complicated equations (much like WHERE part of an SQL query) and find companies matching those criteria. For the above, I currently have more than 500 columns in the database table (each column representing a financial field). Example of Columns are: company_name, sales_annual_00, sales_annual_01, sales_annual_02, sales_annual_03, sales_annual_04, protit_annual_00, profit_annual1...(over 500 such columns). The number of rows is around 5000. Going forward, I would like to further increase the number of columns/financial-fields. For the above I would like to get help regarding: 1) What is the best database design approach? Is it ok to have these many number of columns? 2) How can it be normalized? (User can use any of these fields in search criteria). 3) Is it ok to stick with MySQL, or modern document based databases like MongoDB should be better for it? P.S. (Update): I have been using MySQL till now and a running example of the usage is at: http://screener.in/companies/89/Formula-- In above there around 500 fields/columns to create your query on, however, I seek to increase that number to much more in future.

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• What does the crash mean? And why is my Ubuntu Blackbox is crashing how can i check deeply?

  - by YumYumYum

  My system was running for a while amount of 6 hour. Two times i loss remote access and it was not functioning anymore IP is gone etc etc. 3 time showing crash but i have no idea what and why. How to know what went wrong? $ last sun pts/0 d51a429c9.access Mon Mar 19 13:44 still logged in sun tty7 :0 Mon Mar 19 12:17 still logged in reboot system boot 2.6.38-8-generic Mon Mar 19 12:17 - 13:49 (01:31) sun pts/0 d51a429c9.access Mon Mar 19 10:05 - crash (02:12) sun tty7 :0 Mon Mar 19 10:00 - crash (02:16) reboot system boot 2.6.38-8-generic Mon Mar 19 10:00 - 13:49 (03:48) sun pts/0 d51a429c9.access Mon Mar 19 09:24 - down (00:35) sun tty7 :0 Mon Mar 19 09:20 - down (00:39) reboot system boot 2.6.38-8-generic Mon Mar 19 09:20 - 10:00 (00:39) sun pts/2 d51a429c9.access Sun Mar 18 18:04 - down (01:14) sun pts/1 d51a429c9.access Sun Mar 18 17:43 - down (01:35) sun pts/0 d51a429c9.access Sun Mar 18 15:07 - 18:47 (03:40) sun pts/1 d51a429c9.access Sun Mar 18 12:58 - 17:42 (04:43) sun pts/0 d51a429c9.access Sun Mar 18 10:21 - 15:06 (04:44) sun tty7 :0 Sun Mar 18 08:56 - down (10:22) reboot system boot 2.6.38-8-generic Sun Mar 18 08:56 - 19:19 (10:22) sun tty7 :0 Sat Mar 17 18:03 - down (14:51) reboot system boot 2.6.38-8-generic Sat Mar 17 18:03 - 08:55 (14:51) sun tty7 :0 Sat Mar 17 15:00 - down (01:38) reboot system boot 2.6.38-8-generic Sat Mar 17 15:00 - 16:39 (01:38) sun pts/0 d51a4297d.access Sat Mar 17 10:45 - 14:32 (03:46) sun tty7 :0 Fri Mar 16 18:46 - crash (20:14) reboot system boot 2.6.38-8-generic Fri Mar 16 18:46 - 16:39 (21:53) $ sensors acpitz-virtual-0 Adapter: Virtual device temp1: +27.8°C (crit = +100.0°C) temp2: +29.8°C (crit = +100.0°C)

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• how to modify another user's .profile from the recovery console?

  - by Pinpin

  Pretty much everything is in the title, really! ;) I installed a few components to compile go programs, and the last step was to add the go directory to the path. Being a total ubuntu noob, I added the line PATH="Path/To/Folder", after the one that was already there. After the first reboot I can no longer log into ubuntu (the screen black-out for a while and then I'm back to the login screen, and the same chime greets me.) I've been able to boot in recovery mode, open the root's profile with vi, but I cant find my other user's profile, nor pretty much anything.. Any hint would be greatly appreciated! Pascal

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• Installation stuck on "Installation Type" screen

  - by Andrew Latham

  I am trying to install Ubuntu 11.10 with Windows 7 from a CD. I am using an HP Pavilion dm4. I've never used Ubuntu (or any Linux) before. Everything goes alright until I get to the "Installation Type" screen. Instead of giving me options, it just has a blank menu, and all the buttons are disabled. When I click "Continue", it gives me an error saying that it can't find the root or something like that. The trial version works fine, but I can't actually install it. Everything on the trial version is really slow, presumably because everything is on the CD or the Windows partition. I did some research, but the only post I could find was http://ubuntuforums.org/showthread.php?t=1870478 Where the only advice is to format the entire drive, which I'm not willing to do. Any suggestions? I'm downloading 10.04 right now and I'm going to try with that instead. EDIT: 10.04 didn't work either. I got to the partitioning screen and got the same problem. I read some more forums, loaded up 11.10 trial from the disk, opened the Terminal and typed sudo apt-get remove dmraid and then y. Then I was actually able to see something on the "Installation type" page: "Erase disk and install Ubuntu" or "Something else". Which is weird, since Windows 7 should be installed. When I click Something Else, I get: /dev/sda /dev/sdb /dev/sdb1 (ntfs) (208 MB) (69 MB used) /dev/sdb2 (ntfs) (477542 MB) (unknown used) /dev/sdb3 (ntfs) (18085 MB) (16094 MB used) /dev/sdb4 (fat32) (4265 MB) (3084 MB used) I have no idea what any of this means. Also, my device for boot loader installation changed from /dev/sda to /dev/sda ATA SAMSUNG MZMPA032 (32.0 GB)

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• Symbolic link all files in directory to show in another directory?

  - by Thomas Clayson

  What I want is to be able to display all files that are ftp'd into /home/ftp in /srv/ftp /srv/ftp is password protected, and has files in it which I don't want to be accessible from the public ftp. So as such I wish that all files uploaded to /home/ftp are automatically symbolically linked (or otherwise) to /srv/ftp. Does this make sense? e.g. ls /srv/ftp: file.sh another.txt something_else.i386 then a user ftp's and drops a file in /home/ftp (or ssh, or whatever) ls /home/ftp: user_file.mk ls /srv/ftp: file.sh another.txt something_else.i386 user_file.mk I hope this makes sense. I have been told that this can probably be achieved using ln to create symbolic links, but I don't want to have to ssh in and create the links every time I (or someone else) puts files over ftp. Thanks! :)

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• How-To limit user-names in LightDM login-screen when AccountsService is used

  - by David A. Cobb

  I have several "user" names in passwd that don't represent real people, and that should not appear on the LightDM login-screen. The lightdm-gtk-greeter configuration file clearly says that if AccountsService is installed, the program uses that and ignores its owh configureation files. HOWEVER, there is less than nothing for documentation about how to configure AccountsService! Please, can someone tell me how to configure the system so that only an explicitly specified group of users are shown on the greeter? I could uninstall AccountsService. I did that before, but it comes back (dependencies, I suppose). TIA

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• How do I publish updates?

  - by Klikini

  A common issue with Unity is the suspend feature, which reboots some computers when resuming. I have figured out how to fix it, tested it, and it works. You change line 11 of /etc/default/grub to: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_sleep=nonvs" I would like to post this as an update for future Ubuntu versions. How do I do this? More info about the changes: Sony Vaio FW350 reboots instead of waking up after sleep/suspend

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• In 12.04: Failed to load session 'ubuntu' [closed]

  - by Stéphane

  Possible Duplicate: There's an issue with an Alpha/Beta Release of Ubuntu, what should I do? I'm using 12.04 beta. Today I was prompted to install some updates, which I did, followed by a reboot. On reboot, X starts, but all I see is a single dialog window in the middle of the screen with the text: Failed to load session 'ubuntu' I don't even see the mouse, or the login screen, just this 1 line of text. When I hit CTRL+ALT+F1 to run dist-upgrade from a command prompt, I get this: The following packages have been kept back: libgnome-desktop-3-2 So to see why it was kept back, I tried the following: $ sudo apt-get install libgnome-desktop-3-2 ... The following packages have unmet dependencies: libgnome-desktop-3-2 : Depends: gnome-desktop3-data (= 3.3.92-0ubuntu1) but 3.3.91-0ubuntu2 is to be installed E: Unable to correct problems, you have held broken packages. Anyone else seeing this, or have an idea how to fix it? If you're going to close it as a duplicate, can you please link to the duplicate question?

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• What word processor can manage left and right pages separately?

  - by chtfn

  I was after a word processor that can manage left and right pages separately so I can have my text on the right pages and my illustrations on the left pages. I know LibeOffice can set "left page" and "right page" formats, but there is no simple way to make the text jump from right page to right page when writing. I don't know what would be the best way to do that, but I guess I need an app that is designed for writing books and do that kind of thing, or an app that can associate a page format with an object format (so the "illustration" format can be exclusively associated with "left page" format, and "text body" exclusively associated with "right page", for example). Or is there an extension for LO or OOo out there that I didn't hear about? Cheers!

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• How do I get Picasa 3.9 to play .MOV files?

  - by user44405

  I have been using Picasa for years, first in XP then in Ubuntu from 8.04 onwards & now in Lubuntu 11.10. For 11.10, I downloaded Picasa3.9.0 from FileHippo & installed it in Wine. Everything works well, except it doesn't play videos from my camera - it just shows a thumbnail - whereas earlier versions played videos OK. The videos appear as **.MOV (QuickTime video) in file manager, & can be played by, for instance, GNOME MPlayer or Movie Player (but not properly by Banshee...). Is there some simple way of getting Picasa 3.9 to play them?

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• not able to login in ubuntu box with root password

  - by pankaj sharma

  i have ubuntu 10.04 on my sytem, i run command apt-get install csh on the system and try to change the shell by command chsh -s but now the prob is when i try to login the system by ssh i am not able to login by any user account except one and try to change the user su - root it is showing cannot execute c: no such file or directory and look in the /etc/passwd file for root account in shell field C is written in place of /bin/sh help me out to restore the settings

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• Cannot find other computers on the network

  - by RDNY

  I have several issues trying to connect to my network. This is not the problem connecting to the Internet through the same router. All my computers are running Windows 7, Vista and XP Pro. I can't see them and they can't see me either. I've already install Ubuntu Studio 11.10 three times and still not showing the network icon at all. I'm new to UBUNTU and LINUX in general. I can't find my group name either.

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• golddictonary and gnome 3

  - by zulu

  I'm very new to Linux . I just want to know that is it safe to install gnome3 in ubuntu 11.04 ? my second question is about golden dictionary in ubuntu . I could not install off-line dictionary . I followed the video, downloaded the packages ,downloaded 7z too . I went to Babylon website there I downloaded dictionary in Hindi but they are in .exe file. I tried to extract .dsl file from .exe file but couldn't get them .I even didn't get the cab file from .exe file but nothing work for me , can anyone tells me how to install off-line dictionary ,or Hindi dictionary or link to get .dsl file,any open source Hindi dictionary ? please help me, Thanx in advance.

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• Formatted Ubuntu partition & now grub says "error: no such partition" - can't enter windows

  - by qwBJ

  I had installed Ubuntu (current version: 11.xx) alongside Windows Vista. Now I formatted the Ubuntu partition & merged it with another partition (without thinking, obviously). Now, when I restart the computer, GRUB probably tries to find the old partition (which does no longer exist) and says: error: no such partition. grub rescue> Now I dont know what to do (I'm a total beginner). I tried to re-install Ubuntu on the newly formatted partition but this won't work, because after removing the install-usb (which I am said to do during installation) I find the above error-message again. I guess I need some way to reconfigure grub OR to reinstall grub/ubuntu (on the newly formatted partition) OR to reinstall the windows boot manager (without reinstall. Windows), but I have no idea how to do either of these things.

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• Wired Network not working on Ubuntu 11.10 + Strange Behavior with Manual Conf

  - by Mauricio Cruz

  I'm new to Ubuntu - to be honest this is my very first day trying it... and I've already spent hours trying to make my wired connection work. I've been using this wired network with Windows and OSX, and in both systems I also had some trouble trying to connect in the past (and the troubleshooters did their magic and helped me get connected). Today, this is what I got: I'm running Ubuntu 11.10; ifconfig: eth0 Link encap:Ethernet HWaddr 78:2b:cb:c3:bf:8f UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:1 errors:0 dropped:0 overruns:0 frame:0 TX packets:343 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:70 (70.0 B) TX bytes:63273 (63.2 KB) Interrupt:20 Memory:e2e00000-e2e20000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:1859 errors:0 dropped:0 overruns:0 frame:0 TX packets:1859 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:149368 (149.3 KB) TX bytes:149368 (149.3 KB) wlan0 Link encap:Ethernet HWaddr 10:0b:a9:82:55:c0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:15484 errors:0 dropped:0 overruns:0 frame:0 TX packets:16871 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:12048377 (12.0 MB) TX bytes:2677679 (2.6 MB) I also have some information from Windows ipconfig /all that I ran at my friend's machine Ipv6 Address: <address> preferential Ipv4 Address: 172.26.65.23 <preferential> Netmask: 255.255.254.0 Default Gateway: 172.26.64.1 DHCP Server : <address> DNS Servers : <address> DNS Suffix : <suffix> The weird thing is that I've tried to configure everything manually, using "Network Connections". When I add everything inside IPv4 Settings, the connection is finally successful, but only for 4~5 seconds before getting disconnected again... Update:I just changed the Connection Method to "Local-Link Only", and the same described above happens: At first, it says "Connection Stablished", but after a few seconds, the wired network gets disconnected. I hope someone can help me get connected! Thanks!

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• Printer State: Idle - /usr/lib/cups/backend/dnssd failed

  - by bilbo88

  A printer was installed and worked but does not now. A job is successfully submitted, but keeps waiting there for printing (as seen from lpq command). Ping to printer works fine. (The printer is on and works as it prints from Windows.) But on the Printer Property, it shows Printer State: Idle - /usr/lib/cups/backend/dnssd failed. The following command does not help either. sudo service avahi-daemon restart Does any one has a solution? Thank you for help.

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• What is Mark Shuttleworth's "Easter eggs" blog a reference to? [closed]

  - by fluteflute

  I saw this blog post today, and I was wondering if there's some meaning within the Ubuntu community that I've missed? (I know what an easter egg is in a computer context.) One of our ducks has started dropping eggs in random locations in the garden. I don’t know which duck, but I assume it’s one of the new females we took in from the SPCA, who hasn’t figured out “nesting” yet. I do love ‘em but they’re not African Grey’s in the IQ department. Anyhow, I think I finally understand why people hide eggs in the garden at Easter. Because ducks used to do it for them! I suppose, for millennia, this has been the season to go hunting for eggs. Now we just substitute chocolate ones instead. For the moment, I’ve kept them in a cool shady spot while I keep an eye out for an actual nest. If a polecat doesn’t find them first, I may be able to slip them onto the nest in time for them to get hatched along with some cousins.

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• How do I get HDMI output working on a Dell XPS 15 L502x?

  - by Jones

  Recently I've bought my dream's notebook, a Dell XPS 15 but since then this dream became a kind of endless nightmare. I'm almost getting crazy to make my graphic card driver work properly, but it seems to be just impossible. Yes, I have a 2GB NVIDIA GeForce GT 540m (Optimus) in it! It simply doesn't work. Every time I generate the xorg.conf Ubuntu hangs on while starting up, which forces me to remove this file to be able to start the notebook with the standard graphic settings. Another problem is that the Dell XPS 15 does NOT have a VGA output, but a HDMI. So, to be able to use a second monitor I have to configure it by the NVIDIA X Server Settings, which just works if the driver is properly initialized with the xorg.conf. I've also tried to make it work with the Bumblebee, but unfortunately it didn't help me much with the HDMI output. Do you guys have any idea to solve this deadlock? Is there any way for me to use my second monitor?

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• Tracking down memory issues affecting a website

  - by gaoshan88

  I've got a website (Wordpress based) that became unresponsive. I SSH'd into the server and saw that we were out of memory. Errors in my apache log files indicated the same... things failing to be allocated due to lack of memory). Restarting the server fixes it. So I look in access.log and error.log around the time of the incident but I see nothing strange. No extra traffic, no unusual requests. In fact the only request around the time of the problem was one from Googlebot for an rss feed... at that point I start to see 500 response codes in the logs until the machine was rebooted. I look in message.log hoping to see something but there is nothing at all for that entire day (which is odd as there are entries for every other day). The site has a large amount of memory allocated to it and normally runs using about 30% of what is available. My question... how would you go about trying to track this down at this point? What are some other log files I could check or strategies I could take?

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