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• Numbers on the launcher

  - by pete of ebor

  Using 12.04 LTS - few days ago, I left my machine on while I went out. On my return, the launcher was showing (it is set to be hidden) and there were small numbers 1-9 on the icons and letters s on the bottom-most icon and t on the rubbish bin. System still worked fine, although the launcher remained visible, and would not hide. After about 20 mins work, they suddenly vanished and the launcher hid itself.. is this a normal action ? It hasn't happened since..

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• How do I install xulrunner in 12.04?

  - by chessplayer

  I am trying to migrate a virtual machine I use for my classes at the university from 10.04 to 12.04 and in that I am using xulrunner so that first, I can have SQLiteManager as a stand alone app next, KNIME can provide help for its nodes I tried adding the the mozilla ppa as described in some posts, e.g. here or here, but when I search for xulrunner in Synaptic I get no match. I read in this link, that xulrunner was left out intentionally, which, frankly, I think is a bad decision! Anyway, does anyone know a way out of this, i.e. how to get xulrunner for 12.04? Any help appreciated!

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• Mouse wheel scrolls down, but not up?

  - by HDave

  I've set up a new machine with Ubuntu 12.04 (x64) and have notice that the mouse wheel scrolls down fine, but when I scroll up, it pages down! I've run xev and have verified that scroll up is registering as button 4 and scoll down is button 5. So everything there is fine. I think that button 4 is somehow mapped to page down instead of scroll up. Any idea how to fix? NOTE: I've read the Ubuntu instructions on how to use imwheel to change mouse button mappings, but it doesn't work on 12.04. See here: https://bugs.launchpad.net/ubuntu/+source/imwheel/+bug/1004812

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• Anti aliasing problem

  - by byronyasgur

  I am auditioning fonts on google web fonts and one that I was discounting was Ubuntu because it looked a bit jagged ( screenshot below taken straight from google); however afterward I read an article where it was mentioned as a good choice, and there was a screenshot where it looked really good ( to me anyway ). I am using windows 7 and have tried looking at it in chrome and firefox. I notice the same thing with some other fonts but this one is a good example because it looks perfect in the screenshot but not so good when I look at it on their site. I know this essentially is a question about setting my computer, but I thought that this would be the best place to pose the question: Is there something wrong with the settings on my machine seeing as it's obviously not showing the font the same on my computer as it did when the article writer downloaded it and used it in an image. The screenshot from Google ... The screenshot from the article above ...

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• Tweaks to allows maximum number of users to login to ubuntu server.

  - by nixnotwin

  I use ubuntu server 10.04 on a fairly good machine, with 2.40 duel-core processor and 2GB RAM. My users login with ssh or samba. I have setup LDAP with PAM to sync user accounts between unix and samba. When I allowed about 90 users to login over ssh at once the server refused login for many users. I am using dropbear as ssh server. Even samba logins failed for many users. I need to allow at least 100 users to login at once. Is there anyway to do this?

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• Unable to login following permission changes in device manager (11.10 + Gnome)

  - by Symanuk

  (Running Gnome 3 on Ubuntu 11.10) Everything working well (at least a couple of months), until recently when I changed the permissions through the device manager on the sda1 /2/ 3 drives, thinking it would save all the switching I seem to have to do between users in order to see / use files I previously copied across from an external drive. Now when I boot up the Ubuntu splash screen loads indefinitely, and if I go in through the GRUB / recover option, i'm getting a load of negative permission messages back (regardless of using the fsck or remount options) Either way = unusable machine (Laptop Dell Inspiron n5050), and no way through to login. I'm looking for: (1) a way back in so any help greatfully received (answers need to be pretty basic as i'm a novice), and (2) if i'm to learn anything, a decent thread on setting permissions within Ubuntu / Gnome 3. I'm new to both Ubuntu & Linux, so please be gentle!! Cheers

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• How to change the IP address on my Ubuntu virtual NIC

  - by DextrousDave

  I have a physical windows system, on which I run Vmware Workstation. Now on VMware I run Ubuntu 12.10. I am running a webserver on Ubuntu via LAMP, inside VMware. Problem: Now my local IP address for my virtual NIC (the one Ubuntu is using) has an address of 192.168.159.7, and my home router only issues IP addresses of the range 10.0.0.x. So if I want to port forward to the virtual NIC, which has a 192.168 address, I cannot, so my LAMP webserver cannot be accessed externally since the router does not know to send the packets on port 80 to the virtual NIC... How do I fix that? The only way I guess is to assign a 10.0.0.x ip address to the virtual NIC?? But how do I do that? I tried to do it on the host Windows machine with 'Get my IP address automatically' but it issues a 192.168 address every time... Thank you

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• Solved: Chrome v18, self signed certs and &ldquo;signed using a weak signature algorithm&rdquo;

  - by David Christiansen

  So chrome has just updated itself automatically and you are now running v18 – great. Or is it… If like me, you are someone that are running sites using a self-signed SSL Certificate (i.e. when running a site on a developer machine) you may come across the following lovely message; Fear not, this is likely as a result of you following instructions you found on the apache openssl site which results in a self signed cert using the MD5 signature hashing algorithm. Using OpenSSL The simple fix is to generate a new certificate specifying to use the SHA512 signature hashing algorithm, like so; openssl req -new -x509 -sha512 -nodes -out server.crt -keyout server.key Simples! Now, you should be able to confirm the signature algorithm used is sha512 by looking at the details tab of certificate Notes If you change your certificate, be sure to reapply any private key permissions you require – such as allowing access to the application pool user.

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• Solved: Chrome v18, self signed certs and &ldquo;signed using a weak signature algorithm&rdquo;

  - by David Christiansen

  So chrome has just updated itself automatically and you are now running v18 – great. Or is it… If like me, you are someone that are running sites using a self-signed SSL Certificate (i.e. when running a site on a developer machine) you may come across the following lovely message; Fear not, this is likely as a result of you following instructions you found on the apache openssl site which results in a self signed cert using the MD5 signature hashing algorithm. The simple fix is to generate a new certificate specifying to use the SHA1 signature hashing algorithm, like so; openssl req -new -x509 -sha1 -nodes -out server.crt -keyout server.key Simples!

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• What can I use to set up a 100% cloud based python IDE + Hosting environment?

  - by PhD

  I'm working a side project and I can't always be on "my" machine to code/deploy the web application. I am aware of various cloud IDEs (e.g., Cloud 9 IDE) and independent Django/Flask etc., hosting services (e.g., Heroku). What is the best way to completely shift my development/deployment environment to the cloud so that I can code/deploy from anywhere? I don't mind using paid services but I'm not sure which cloud IDEs play nice with which hosting services. Has anyone tried this setup before? What has or hasn't worked? I want to minimize the manual intervention in 'connecting the two services' as much as possible. I'm going to be using Django, MySQL and Redis for the web-app

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• Ubuntu 13.10 alongside Windows 7 - Mission Impossible?

  - by Przemek Jedlikowski

  I just want to install Ubuntu 13.10 alongside Windows 7 HP on my EeePC 1215N. I can't do it when Windows 7 is booted up (wubi.exe hasn't got that option), so I booted it from USB key. Everything's loaded, I double-click Install Ubuntu. I click 'Next ', then I choose that I want to install Ubuntu alongside Windows 7. And the machine restarts. Not resets. Restarts. X server's killed immediately, I can see the console only. What do I have to do now?

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• Configuring Dropbox on Ubuntu server

  - by Daniel

  I've got a Ubuntu server running on an old laptop. The OS is on a 4GB USB drive and I use a SATA drive attached for storage. Now I wanted to set up Dropbox on this machine. I've got it running using this guide: http://www.byteindia.com/internet/install-dropbox-on-linux/482/. But I haven't synched yet because there won't be enough room in my home dir. My /home is on my 4GB USB since I never use it and all my data is on the 2TB drive mounted in /media/. What is the best way to set this up? Dropbox doesn't support moving the folder in Linux yet. I found a script to move the folder but it seems outdated. Perhaps I can use symlinks in some clever way? Or maybe move my /home folder to my SATA drive? Thanks in advance

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• How do I safely use a virus infected USB drive in Ubuntu?

  - by suhridk

  I have an USB drive which I know is virus infected (an anti-virus on my friend's machine detected it). Unfortunately neither of us know the virus name and I don't want to take the risk of plugging it to my Windows box again. Of course, in all probability the virus affects only Windows. (But I'm not sure) I want to know if I can safely plug the USB into my Ubuntu Lucid laptop and copy the stuff I need from the drive. If there are some precautions I need to follow what would they be?

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• Behavior tree implementation details

  - by angryInsomniac

  I have been looking around for implementation details of behavior trees, the best descriptions I found were by Alex Champarand and some of Damian Isla's talk about AI in Halo 2 (the video of which is locked up in the GDC vault sadly). However, both descriptions fall short of helping one actually create a BT, one particular question has been bugging me for a while. When is the tree in a behavior tree evaluated? Furthermore: If the tree is in the middle of executing a sequence of actions (patrolling waypoints) and a higher priority impulse comes in (distraction sound) , how to switch to that side of the tree seamlessly without resorting to a state machine like system and if it is decided that the impulse was irrelevant (the distraction is too far away to affect this guard), how to go back to the last thing that the guard was doing ? I have quite a few questions like this and I don't wish to flood the board with separate queries so if you know of any resource where questions like these can be answered I would be very grateful.

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• How can you predict the time it will take for two processes in two different machines in a cluster to communicate?

  - by Dokkat

  I am trying to develop a computing application which needs a lot of memory (500gb). Buying a single machine for that is overly expensive. I can, though, buy ~100 small instances on Digital Ocean or similar, divide the memory in blocks and use TCP to emulate shared memory between the instances. Now, my question is: how can I measure/predict the time it will take for two processes in two different machines like that to share information, in comparison to IPC and shared memory? Are there rules of thumb? I don't want exact values, but knowing more or less how much faster one is would be very helpful in visualising the feasibility of this approach.

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• How to use PostgreSQL on AWS - Ubuntu 11.10

  - by That1Guy

  I'm extremely new to cloud-computing, Linux, and PostgreSQL, so if this is a stupid question, I apologize. I've managed to create an m1.large instance running Ubuntu 11.10, connect via Putty SSH, and install PostgreSQL (sudo apt-get install postgresql), but that is as far as I've gotten. My goal is to run several python web-scraping scripts that I've written on this instance (so as not to eat up all of our bandwidth (smaller company at the moment)) and insert the scraped data into a PostgreSQL table on the instance and later retrieve that data to store on our local server (as I've heard AWS EBS is unreliable and I don't want to take chances). How can I configure PostgreSQL on my AWS instance? How can I access the data from my machine? I currently use PgAdmin3 to manage PosgreSQL on our local server. Can I use this same interface to manage PostgreSQL on my AWS instance? Any suggestions, solutions, links, etc is greatly appreciated. And again, if this is a dumb question, I apologize.

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• Ubuntu 12.04 Touchscreen Calibration

  - by Lee

  I have a machine with Ubuntu 12.04 installed, with dual monitor, via VGA and DVI Interface. The monitor is one touch screen and the other one is regular LCD Monitor. The touch screen is made in China with some unknown brand, and I am using eGalax Driver. The touch screen is now detected and works, but i need to do some calibration since it does not correctly perform click on touch. The problem is, when I’m using xinput_calibrator, it shows 4 crosses to be clicked on, because I’m using dual monitor, the crosses is now show 2 on the touch screen (touchable) and the others on the other monitor which is regular non-touch monitor. Please help, thank you.

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• Sound works for only one user at a time

  - by Patrick

  I've noticed that sound becomes unavailable to me when someone else is logged into my machine and playing music (or has facebook open) in the other account. I've had to ask them to unlock their account and turn it off so I can get sound in my own stuff. Even in sound preferences, the hardware itself disappears and output is "dummy sound". Is there a way to prevent this from happening? What would be really good is if I could turn down the volume (or mute entirely) all the sounds on all other accounts on a per-user basis from my sound preferences without affecting whatever setting they have - essentially saying whenever user A is logged in, all sounds from user B's account are muted and anything from user C's account is at 50% while I can still have my own at full volume.

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• How can I run Tellme more software on Ubuntu 14.04 LTS?

  - by Alex Walker

  I'm new to Ubuntu and I've been loving it so far, I have it on my 2 computers and I think everyone should try it. I run an English Laboratory in a University (Our PC's are old and slow) so I want to install Ubuntu on all of them so the students can have a better experience here, the problem is tha we NEED Tell me more Software which I believe it's only for windiws. How can I install it in ubuntu? do I need wine or a virtual machine with Windows? please help! and thank you so much!!

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• Where does node.js install to?

  - by Ash Scott

  I'm trying to install a script, which is a clone of a game, and uses node.js for it. Now, the documentation says I should copy the node.exe (windows) and put it where the clone is. Now, I can't find the node.exe ubuntu equivalent, I can't even find where it's installed?! Don't really want this hosted on a windows machine due to licensing. Here's a snipet from the doc: Download : Node.js (Install Button) Go where you are install Node.js (For Windows 8 it's C:/Programms/nodejs) Copy node.exe and paste on the clone folder Now I need to do this in ubuntu, however I can't find where node is installed to? Any ideas?

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• Copying an SSH Public Key to a Server

  - by Nathan Arthur

  I'm attempting to setup a git repository on my Dreamhost web server by following the "Setup: For the Impatient" instructions here. I'm having difficulty setting up public key access to the server. After successfully creating my public key, I ran the following command: cat ~/.ssh/[MY KEY].pub | ssh [USER]@[MACHINE] "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys" ...replacing the appropriate placeholders with the correct values. Everything seemed to go through fine. The server asked for my password, and, as far as I can tell, executed the command. There is indeed a ~/.ssh/authorized_keys file on the server. The problem: When I try to SSH into the server, it still asks for my password. My understanding is that it shouldn't be asking for my password anymore. What am I missing?

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• Implementation of a Rules Engine in Your Business Applicaitons

  - by enonu

  I'm for an experience driven answer from a few software engineers who have implemented a rules engine in their internal business applications. How has it affected your business in the following ways: Ability to launch and iterate over business driven logic Ability to have "business users" perform the actual modification of those rules rather than developers. Ability to comprehend the business rules in general. Quality of the software releases. More or less bugs from the end-user's POV? Speed of the applications. If you had to do it all over again, what would you do differently? Lastly, I'm looking for a qualification of your answer w/ respect to the architecture. Would you do the same thing if you were deploying to a 1-machine setup vs. your architecture vs. a multi-tier cloud-based distributed architecture using 1000s of machines? How would it be different? Thanks!

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• INVITATION: Formez-vous sur la solution Oracle Database Appliance !

  - by mseika

  Formez-vous sur la solution Oracle Database Appliance ! Cher partenaire, Arrow a le plaisir de vous inviter au bootcamp ODA - Oracle Database Appliance - qui aura le 30 octobre prochain à Colombes, dans les locaux d’Oracle France. Venez découvrir comment conquérir de nouveaux marchés grâce à lanouvelle appliance base de données Oracle! Arrow vous propose une demi-journée pour comprendre ODA et démontrer les bénéfices de cette solution accessible à tous. Au programme de cet après-midi de formation : une démonstration réalisée en temps réel sur la machine Arrow, déplacée pour l’occasion et de multiples échanges avec notre spécialiste ODA , Stéphane KIDJO, Consultant Avant-Vente chez Arrow. AGENDA : 14h00 - Accueil-café14h20 – Lancement de la démonstration :• Présentation et installation de l’appliance• Présentation de la solution : positionnement marché, bénéfices• Proposition de valeur• Une solution tarifaire attractive 16h00 - De nouvelles opportunités pour vendre Oracle 11g R2 et ses options 16h30 – Désinstallation de l’appliance 16h45 – Questions & Réponses 17h00 – Echanges autour d’un goûter Ce workshop est gratuit. Pré-inscription obligatoire. Nombre de places limité.

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• Using Ubuntu with a dial-up connection

  - by Robert Heller

  Is it possible to install Ubuntu on a machine with only a dial-up connection? That is, does the Ubuntu install CD come with everything needed to set up an Internet connection using a dial-up modem (I have a USRobotics Courier V.Everything connected to a RS232 port on a Lava Quattro-PCI). I presently run CentOS (5.9), which does include support for dialup Internet access out-of-the-box (all of the modules for dialup are on the distro DVD). When I ran the UBuntu CD (12.04.1 desktop), there was no sign of dial-up Internet support. Am I faced with a chicken or egg problem?

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• Which VCS is more applicable for our workflow?

  - by Thomas Mancini

  Currently we have code stored on a shared network drive and do not use any kind of VCS. The code stored on our shared network drive is always being backed up. We would like to keep things as close to they are now as possible, while using some kind of VCS software. I am envisioning a centralized workflow with each developer having a local copy of the code on his/her machine. We don't do any branching or working offline. Typically when we spin off a new version we would just copy the current working directory to a new directory. I believe we would continue doing this and just create a repository for the new version. I would rather not get into an argument over which VCS is better, just hoping to get some opinions for which is best suited and most applicable for what we are trying to do.

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