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• Unable to run 'sudo apt-get dist-upgrade' due to authentication issues

  - by TobyG

  I've just attempted to run sudo apt-get dist-upgrade on my Ubuntu box, but am getting the following error... WARNING: The following packages cannot be authenticated! librdbmspp php5-ioncube-loader sw-libboost-date-time1.49.0 sw-libboost-system1.49.0 sw-libboost-filesystem1.49.0 sw-libboost-program-options1.49.0 sw-libboost-regex1.49.0 sw-libboost-serialization1.49.0 sw-libpoco I've tried running... $ sudo apt-key update $ sudo apt-get update ... as found in this question, but I'm still getting the error. Can anyone help, please? Update on 5th June Repos currently in /etc/apt/sources.list (links broken due to reputation being too low to include more than 2 links)… deb http: //gb.archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse deb http: //gb.archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse deb http: //gb.archive.ubuntu.com/ubuntu precise-security main restricted universe multiverse deb http: //archive.canonical.com/ubuntu precise partner deb-src http://archive.canonical.com/ubuntu precise partner deb http: //security.ubuntu.com/ubuntu precise-security main restricted universe multiverse deb-src http://security.ubuntu.com/ubuntu precise-security main restricted universe multiverse deb http: //autoinstall.plesk.com/ubuntu/PSA_11.5.30 precise all deb http: //autoinstall.plesk.com/debian/SITEBUILDER_11.5.10 all all deb http: //autoinstall.plesk.com/debian/BILLING_11.5.30 all all

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• MapReduce

  - by kaleidoscope

  MapReduce is a programming model and an associated implementation for processing and generating large data sets. Users specify a map function that processes a key/value pair to generate a set of  intermediate key/value pairs, and a reduce function that merges all intermediate values associated with the same intermediate key. Many real world tasks are expressible in this model, as shown in the paper. Programs written in this functional style are automatically parallelized and executed on a large cluster of commodity machines. The run-time system takes care of the details of partitioning the input data,  scheduling the program's execution across a set of machines, handling machine failures, and managing the required inter-machine communication. This allows programmers without any experience with parallel and distributed systems to easily utilize the resources of a large distributed system. Example: A process to count the appearances of each different word in a set of documents void map(String name, String document):   // name: document name   // document: document contents   for each word w in document:     EmitIntermediate(w, 1); void reduce(String word, Iterator partialCounts):   // word: a word   // partialCounts: a list of aggregated partial counts   int result = 0;   for each pc in partialCounts:     result += ParseInt(pc);   Emit(result); Here, each document is split in words, and each word is counted initially with a "1" value by the Map function, using the word as the result key. The framework puts together all the pairs with the same key and feeds them to the same call to Reduce, thus this function just needs to sum all of its input values to find the total appearances of that word.   Sarang, K

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• Block p2p downloading in my office?

  - by Andrew

  I work in an education office in a third world country. We pay for internet by the megabyte (no other choice) and have lately been using an incredible amount of bandwidth. This is because the office staff have found out about p2p sharing. As far as I know, Limewire is the only program they're using, but I'm sure it's just a matter of time before they discover the more general world of bittorrent. Using only a linksys router (that I could flash), is there any way for me prevent the office from destroying our bandwidth cap by downloading personal items (against policy). Even semi-fixes would be better than nothing.

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• How to set IP address of Amazon EC2 instance to its Elastic IP?

  - by TWord

  Hi, I have an Amazon EC2 instance running and I am installing a program on it that needs to know what the machine's IP address is. Can I set the Elastic IP address to the IP address within the EC2 instance? Its okay if it reroutes data packets somewhere 'outside' and then back to itself, but the software NEEDs me to specify an IP address of the machine its on. I proceeded with the software installation using the "local IP" (10.xx.xx.xx) within the software installation. I don't know if this is the reason why the application is not visible publicly (as I'm trying to determine in the question http://serverfault.com/questions/166946/allowing-web-access-to-an-amazon-ec2-windows-server-2008-instance-running-tomcat)

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• If i make a mail server can i send bulk email?

  - by Jake Smith

  I work for a small company and we have fallen into the fad of "email campains" a.k.a Junk mail. So far the company has gotten a subscriber list from our website, and paid a good chunk of change for a emailer program. The problem is, Our list has close to 4,000 people on it and growing. with gmail only allowing 100 emails per account through on SMTP and I am on a tight budget so I cant hire anyone else. I was thinking of doing a dedicated mail server off of the website server we have running in the office. Is it possible? to make emails on your own server, and then send it through your own SMTP? if it is, what software would I need and is if free or low cost at least. We run a WAMP server, i set it up just for information, but i could switch it to lamp or whatever if need be. Thank you for your time and youre answers

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• How can I deal with file association in different application(not in Nautilus)?

  - by Julius

  Maybe i don't understand the system. Upgraded to (reinstalled) Ubuntu 11.04. Is there any way the applications can use something that i set in nautilus, or it's just a wrong idea about the usage? In nautilus the file association works great, easy, handy and so on... My first problem was when installed chromium. Downloaded a file, a popup ask for assocation, set nautilus. And it only opens folder, for any file show an error: it is not a direcrory. Ok, so i thought Google chrome changed, because previously .pdf open acrobat,.torrent open vuze and so on. But now i have to open nautilus on download folder with it, than select and open the preferable application by manually and can't use any automatism i used to. Then in gnome commander , it not followed the default association i set in nautilus. Ok maybe it is commander fault. use it's own. Then in calibre, the "read" use again this default "can't open its not a directory" error So it's seems to me the applications not using well this file associations or i really don't understand the aim of file associations system (mime,.desktop files,...) If there is no solution i think i have to search some program (if any exist's) which can identify and launch application and set as default instead nautilus.

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• How to use launchd to ensure an application is running?

  - by zneak

  Hello guys, I use Quicksilver, which is a nifty program that really speeds up my work. I've set it to launch when I log in. However, since Snow Leopard, it's become a bit less stable, and once in a while, it crashes. And obviously, it won't restart by itself. I'm pretty sure I can use launchd to ensure it's always running when I'm logged in. Is there a good guide/example of how to make sure a process restarts when it's killed/terminated/crashed with it?

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• Font corruption: lines through characters

  - by Aibara Iduas

  I have an odd problem where a one-pixel high white line is displayed through certain letters of text. Almost always only a single character type is affected at once, and only in one font size (though that size can change over time). Most of the time things are fine, but this happens several times a day. It's been happening ever since I upgraded to 10.10. I have noticed few patterns: It might be a problem with Firefox (I'm currently using the nightly ppa, but it occurred in 3.6 also) - but this could just be because I spend most of my time on my computer either at a browser or text editors. I seem to remember it happening with the buttons on various Gnome dialogs. It never occurs in text I've typed, be it an email, url bar, etc. In Firefox it happens across tabs, and the problem remains even if they are closed or reloaded; only restarting the program can fix it. Two examples (in the first, only the larger "r" is corrupted): Any help would be appreciated, thanks.

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• Frame Independent Movement

  - by ShrimpCrackers

  I've read two other threads here on movement: Time based movement Vs Frame rate based movement?, and Fixed time step vs Variable time step but I think I'm lacking a basic understanding of frame independent movement because I don't understand what either of those threads are talking about. I'm following along with lazyfoo's SDL tutorials and came upon the frame independent lesson. http://lazyfoo.net/SDL_tutorials/lesson32/index.php I'm not sure what the movement part of the code is trying to say but I think it's this (please correct me if I'm wrong): In order to have frame independent movement, we need to find out how far an object (ex. sprite) moves within a certain time frame, for example 1 second. If the dot moves at 200 pixels per second, then I need to calculate how much it moves within that second by multiplying 200 pps by 1/1000 of a second. Is that right? The lesson says: "velocity in pixels per second * time since last frame in seconds. So if the program runs at 200 frames per second: 200 pps * 1/200 seconds = 1 pixel" But...I thought we were multiplying 200 pps by 1/1000th of a second. What is this business with frames per second? I'd appreciate if someone could give me a little bit more detailed explanation as to how frame independent movement works. Thank you.

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• Able to ping but does not get the data

  - by Dany

  I am facing a problem in my client server program; when using wireless I can ping but not receive any data. There is a source which receives a streaming request from client via server. This works fine when all the machines are connected through LAN cable but when I put all the computers in wi-fi network, all the machine are able to ping each other but when the client send the stream request to the server the ping request between server and client says destination unreachable. It works all well until the client does not send the streaming request. What might be the issue?

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• I've inherited 200K lines of spaghetti code -- what now?

  - by kmote

  I hope this isn't too general of a question; I could really use some seasoned advice. I am newly employed as the sole "SW Engineer" in a fairly small shop of scientists who have spent the last 10-20 years cobbling together a vast code base. (It was written in a virtually obsolete language: G2 -- think Pascal with graphics). The program itself is a physical model of a complex chemical processing plant; the team that wrote it have incredibly deep domain knowledge but little or no formal training in programming fundamentals. They've recently learned some hard lessons about the consequences of non-existant configuration management. Their maintenance efforts are also greatly hampered by the vast accumulation of undocumented "sludge" in the code itself. I will spare you the "politics" of the situation (there's always politics!), but suffice to say, there is not a consensus of opinion about what is needed for the path ahead. They have asked me to begin presenting to the team some of the principles of modern software development. They want me to introduce some of the industry-standard practices and strategies regarding coding conventions, lifecycle management, high-level design patterns, and source control. Frankly, it's a fairly daunting task and I'm not sure where to begin. Initially, I'm inclined to tutor them in some of the central concepts of The Pragmatic Programmer, or Fowler's Refactoring ("Code Smells", etc). I also hope to introduce a number of Agile methodologies. But ultimately, to be effective, I think I'm going to need to hone in on 5-7 core fundamentals; in other words, what are the most important principles or practices that they can realistically start implementing that will give them the most "bang for the buck". So that's my question: What would you include in your list of the most effective strategies to help straighten out the spaghetti (and prevent it in the future)?

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• Installing Collective Access

  - by Michele

  I am VERY new to installing any type of server program and to running any opensource type software in general. I am running Windows Server 2008R2. I want to install Collective Access to run locally only on my Intranet at home. So my host is localhost I sucessfully installed PHP and MYSQL. I installed CA in this directory C:/inetpub/wwwroot/collectiveaccess. 1st. I do not want to send mail through collective access. Will it install without all the email information? Can I comment those requirements out in the global config and setup.php file? 2nd I am getting the error. Configuration file is missing for hostname 'localhost' this is what I have in the set up file: define("CA_WEB_ROOT_DIR", "c:inetpub/wwwroot"); define("CA_URL_ROOT", "/collectiveaccess"); define("CA_SITE_HOSTNAME", "localhost"); define("CA_DB_HOST", 'localhost');

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• What are my choices for server side sandboxed scripting?

  - by alfa64

  I'm building a public website where users share data and scripts to run over some data. The scripts are run serverside in some sort of sandbox without other interaction this cycle: my Perl program reads from a database a User made script, adds the data to be processed into the script ( ie: a JSON document) then calls the interpreter, it returns the response( a JSON document or plain text), i save it to the database with my perl script. The script should be able to have some access to built in functions added to the scripting language by myself, but nothing more. So i've stumbled upon node.js as a javascript interpreter, and and hour or so ago with Google's V8(does v8 makes sense for this kind of thing?). CoffeeScript also came to my mind, since it looks nice and it's still Javascript. I think javascript is widespread enough and more "sandboxeable" since it doesn't have OS calls or anything remotely insecure ( i think ). by the way, i'm writing the system on Perl and Php for the front end. To improve the question: I'm choosing Javascript because i think is secure and simple enough to implement with node.js, but what other alternatives are for achieving this kind of task? Lua? Python? I just can't find information on how to run a sandboxed interpreter in a proper way.

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• Nohup & Sass: Process keeps running but, after a while, *.scss files do not get compiled

  - by maurits

  I am using Sass on a CentOS 5.8 server and want it to keep running after SSH logout, so that other users can edit *.scss files for days or even weeks to come without any need to start the program each time they login (in fact, they don't even have SSH access). I have used the following command from this question/answer: $ nohup sass --watch path/to/scss/files:path/to/css/output/files & Then, I log out of the SSH session and the process keeps running. It all works fine (logging in again and using touch to create a test file (test.scss) correctly triggers the creation of the corresponding test.css file) for the first few minutes, but after a while the *.scss files stop getting compiled... However, ps aux | grep 'sass' Shows that the process is still running. Anybody knows what am I doing wrong?

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• NTP doesn't sync

  - by Jonathan

  I'm using Meinberg NTP to sync the time in a VPS. The clock refuses to sync - there's a ~30s shift comparing to other servers. Meinberg NTP comes with a status script that checks hte delay\jitter every 10s and it is showing all zeros. Actions I've taken which didn't help: Restarted the NTP service using a script that comes with Meinberg NTP Added port 123 for UDP and TCP as an exception port to Windows Firewall Added Meinberk NTP executables as an exception program to Windows Firewall validated iburst appears after each server listed in the configuration file Restarted the server The OS is a Windows Server Standard SP2 32bit. What did I miss?

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• Thunderbird 3.1.7 file system and file extensions

  - by Sharon Bode

  I have lost all email messages and folders in my Thunderbird program. Where can I look for them? The messages were organized in folders for several years. My system is Windows XP. I have looked in the Thunderbird Profiles default profile folder. I can see Inbox and Trash but none of the other folders I have set up are visible. I cannot directly open Inbox or Trash so I don't know if my lost messages are in these folders. Others in the Community Forum seem to have the same problem but no one has answered them or me. Is there someone in this community who can help? Thank you, Sharon Bode

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• How to upgrade to Windows 8.1 on a machine with a Users folder on a separate drive?

  - by ahsteele

  I tried to upgrade from Windows 8 to Windows 8.1. Unfortunately, during the upgrade process I receive the following error: Sorry, it looks like this PC can't run Windows 8.1. This might be because the Users or Program Files folder is being redirected to another partition. Which is accurate in that I have my Users directory on my D: drive and Windows installed on my C: drive. I do this because my C: drive is an SSD drive and D: drive is a spinning rust drive where I keep my data. Is it possible to upgrade to Windows 8.1 from a Windows 8 install with a redirected Users folder? I do not consider a full reinstall of Windows 8 with a non-mapped Users folder and then upgrading that installation to be "upgrading."

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• Dye Sub printer with specific prints remaining - can I command-line query this?

  - by Jason N

  Hey, I've got a Sony Dye-Sub printer that holds ink/paper sets - i.e. a very certain amount of ink and paper for ~200 prints. This information is available to me from within Control Panel Printers Preferences Printer Device Information (i.e. current 189 remaining prints). Any way I can perhaps get this information from the command line? I'd like to write a little program to tell me when the number of prints gets low (i.e. < 20), rather than suffer the annoying Windows "run out of paper" popup. I've found the Windows VBScript print utilities, but can't seem to find the request I need for this. Any suggestions? Jason

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• Looking for a router-like web interface for my Debian gateway.

  - by marcusw

  Hey, I need a web interface program for my debian gateway which has the features of a router's one. Specifically, I must be able to easily Forward ports to various clients on the LAN or the router itself (it's also a server) Manage a DHCP server preferably including DHCP reservation for certain MACs Give me a list of the connected DHCP clients (optionally) Show which clients are the most active as far as bandwidth (something like iftop) Alternatively, it could be a graphical app which I could tunnel over ssh. No command line programs please...I'm used to doing this stuff with a point-and-click interface. Not adverse to command-line setup; just need to be able to reconfigure things graphically. Have a working LAMP setup. I've tried webmin, but it didn't satisfy the "easy" part...too many clicks and too many meny options.

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• Custom daemon script: works, but does not run at boot / startup

  - by pearjoint

  this is Ubuntu 10.10 Maverick. I have the following shell script in init.d that I want to run as a "daemon" (background service with start/stop/restart really) at system startup. There is a symlink in rc3.d. I tried 4 and 5 too. (Ideally this would initialize before graphical login happens and before a user logs in.) IMPORTANT: the script works 100% as expected and required when testing this with service MetaLeapDaemon start and service MetaLeapDaemon stop. (This shell script calls a Python program which makes sure the appropriate .pid files are both created at startup and deleted at exit.) So generally it works fine but now my only issue is why it will not be run at any of the run-levels I tried. I know for sure it isn't run because the log file it normally creates does not get created. As you can see (by the lack of any uid:gid args in the start-stop-daemon commands) this would currently run only under root, is this forbidden in a default setup? Here's the script, pretty much your run-off-the-mill daemon script really: #! /bin/sh DAEMON=/opt/metaleap/_core/daemon/MetaLeapDaemon.py NAME=MetaLeapDaemon DESC="MetaLeapDaemon" test -f $DAEMON || exit 0 set -e case "$1" in start) start-stop-daemon --start --pidfile /var/run/$NAME.pid --exec $DAEMON ;; stop) start-stop-daemon --stop --pidfile /var/run/$NAME.pid ;; restart) start-stop-daemon --stop --pidfile /var/run/$NAME.pid sleep 1 start-stop-daemon --start --pidfile /var/run/$NAME.pid --exec $DAEMON ;; *) N=/etc/init.d/$NAME echo "Usage: $N {start|stop|restart}" >&2 exit 1 ;; esac exit 0

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• Converting a DWG/DXF to CSV or Excel

  - by Menno Gouw

  I'm using ZWcad and i need to get the coordinates of hundreds of blocks into a excel sheet or .CSV file so i can import that into the GPS hardware. I know there are plenty of tools for autocad, i probably can even write one myself but as far as ZWcad goes i seem to be out of options. However ZWcad saves to DWG too, and exports to all the other familiar cad extensions. So i was wondering if i would just save the blocks i need to export to a certain file there might be a tool/program to convert that directly into .CSV.

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• Simulating network latency for localhost connection on Windows 7

  - by nitro2k01

  I need to simulate network latency to a program running on the local computer, connecting to a local service. Thus far I have tried dummynet (a windows build of ipfw) which I got working after some trial and error. While it generally works, I can't seem to get it to filter localhost traffic. Even after adding a rule from any to any which affects external traffic, this makes no difference for local connections. I would appreciate if anyone knows how to simulate local latency using dummynet or a different tool. The tool should be able to simulate latency generically in IP packets, (TCP and UDP) and not be protocol specific.

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• How to pipe differently the body of the curl answer and the printed output?

  - by Antoine Lizée

  I would like to print in the command line some output of curl, like the http headers, followed by the body of the answer processed by a stdin/stdout program. For instance: Print the status code: curl -s -w "%{http_code} \\n" -o "/dev/null" http://myURL.com And then process the output with a json parsing tool: curl -s http://myURL.com | python -mjson.tool I would like to do both with one command, and I have the feeling that it may be possible thanks to the -o option that makes the difference between the output of curl and the actual answer from the query. The problem is that -o writes directly to a file. Somebody's got a hack?

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• How to use UMLFS?

  - by Vi

  I'm trying to mount what is inside UML session as FUSE filesystem on host. There's "uml_mount" program which looks like a thing for this purpose, but it fails. What is UMLFS (I haven't found any documentation at all) and how to mount it? uml_mount mounts FUSE filesystem and starts uml_mconsole <umid> umlfs <file descriptor> which tries to send this file descriptor to UML kernel (to deal with further FUSE things), but sending fails. Also I haven't found any signs of FUSE inside a kernel. Do I need some special patch for this?

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• Recommendations for a web-based help system

  - by ggkmath

  Hi Experts, I'm putting together a fairly large GUI. I'm a tech person, but more on the hardware side, not software. I'm wondering what software package would be best suited to enable me to generate a web-based help-system. Preferably it takes care of a lot of coding, allowing me to focus on the content. For example, the user would click on a link in the GUI when they have a question, that brings them to a web-based Help Guide, for example, providing an overview of how to use the GUI, perhaps a searchable index (key-word based index), table of contents, etc, for navigating through the Help Guide. My first thought was to program everything in XHTML using Dreamweaver, but my layout requirements are fairly modest (just figures and text, maybe a few equations), and I'd prefer not to spend a lot of time concentrating on the programming. Was wondering if any software existed that made generating web-based navigatable pages easy to create/publish. Again, I'm not really a programmer, so if there's something obvious out there, I'm probably not aware of it. Any advice much appreciated! Thanks in advance.

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