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• 8 Deadly Commands You Should Never Run on Linux

  - by Chris Hoffman

  Linux’s terminal commands are powerful, and Linux won’t ask you for confirmation if you run a command that won’t break your system. It’s not uncommon to see trolls online recommending new Linux users run these commands as a joke. Learning the commands you shouldn’t run can help protect you from trolls while increasing your understanding of how Linux works. This isn’t an exhaustive guide, and the commands here can be remixed in a variety of ways. Note that many of these commands will only be dangerous if they’re prefixed with sudo on Ubuntu – they won’t work otherwise. On other Linux distributions, most commands must be run as root. Image Credit: Skull and Crossbones remixed from Jason Ford on Twitter How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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• Compiling C++ Source code?iostream.h not found?

  - by gabriel

  I do not want to discuss about C++ or any programming language!I just want to know what am i doing wrong with linux ubuntu about compiling helloworld.cpp! I am learning C++ so my steps are: open hello.cpp in vim and write this #include <iostream.h> int main() { cout << "Hello World!\n";` return 0; } So, after that i tried in the terminal this g++ hello.cpp AND the output is hello.cpp:1:22: fatal error: iostream.h: No such file or directory compilation terminated. What do you suggest? Any useful step by step guide for me?Thanks!

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• 10 Package Management Operations You Need Synaptic for on Ubuntu

  - by Chris Hoffman

  The Ubuntu Software Center is a solid, user-friendly application, but sometimes you need more power. The Synaptic package manager – previously included with Ubuntu by default – can do many things the Ubuntu Software Center can’t. You can install Synaptic from the Ubuntu Software Center – just search for Synaptic. You can also perform all these operations from the terminal – but, if you need a powerful graphical application for managing packages, Synaptic can’t be beat. How to Play Classic Arcade Games On Your PC How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8

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• Acer Aspire one is falling apart on Ubuntu

  - by Narcolapser

  Question: How do I have my netbook detect and install hardware? Info: I have an Acer Aspire One, it came with windows XP and I loaded it with Win7. I decided I wanted to change to Ubuntu so I tried Ubuntu netbook remix, which failed horribly, and so after attempting 3 or so other OS's I ended with Ubuntu Desktop 9.10. Which worked fine for a while, but there were some minor issues so I asked a question about it here and decided to change my OS again. This last weekend I tried mandriva like that guy in my other question suggested, no success. when I had though my netbook lost the ability to use it's touch pad, I didn't think much of it, just thought it must be a driver or something. But When Mandriva failed, and I also while I was at it tried Damn small linux and Debian, which both failed to, I decided to switch back to Ubuntu Desktop(some where in here my keyboard stopped working for one attempt to). But first I gave the netbook remix one more try. it worked this time, with the exception of it didn't have any networking. I thought it was a driver issue again and finished the weekend with ubuntu desktop 9.10 again. But now things get really crazy. it doesn't know it has a wireless card or an ethernet card. It doesn't know my phone is connected trying to provide wireless broadband either. I'm clueless on what could be the problem. And with only a minimal amount of experience with Ubuntu can't navigate the entire interface with only my keyboard(it doesn't detect a USB mouse when I plug it in, it had when I installed it. in fact the network interfaces were working just fine when I live boot ubuntu to installed it). Even so, I don't know where to go or what to do to make it recognize it's hardware. I'm in a dire situation, any help is welcome.

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• Linux Port 80 to redirect to a Windows box

  - by Richard Staehler

  I have 2 servers here at work. One is a Windows 2008 Server R2 (for safety's sake, lets use 192.168.1.100) and the other is a Fedora 14 (192.168.1.101). Currently when you hit our subdomain, x.test.com, our routers tell it to go to our Fedora box, and since Apache is installed and listening to port 80, it displays the Fedora Apache Test Page. It's obvious that I don't use port 80 for this machine, however I do use NAGIOS on it and its always nice to be able to access that from anywhere in the world. So when I want to access it, I just type x.test.com/nagios. Now here comes the dilemma.... On the Windows R2 box, we recently have installed a program that requires us to setup a web server using IIS7. Because of this application, I'm going to be creating a new subdomain called y.test.com, but since we only have 1 WAN/router, it will still get pointed to our Fedora box. That being said, it wants to use port 80 as well (or whatever port I damn well wish to assign it). So my question is: since our router is pointing to the Fedora 14 box (.101), and I want to make sure I can access NAGIOS from anywhere in the world, how do I tell Apache (httpd) to redirect port 80 to the other server (.100)? If not possible, what are my other options? I have rinetd installed on Fedora and have even tried the option 192.168.1.101 80 192.168.1.100 80 and it didn't seem to work "because port 80 was already bound" Thoughts? and Thanks!

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• Steam-Linux behind a proxy server

  - by Karthik

  I just downloaded Steam Beta from here. I installed the package, and when I start steam, I get the following It then says, unable to connect. When I start it from the terminal, I get this error. SteamUpdater: Error: Download failed: http error 407 Since I get a 407 error, it is related to Proxy Authentication. I have set up my http_proxy, ftp_proxy, https_proxy environment variables. I am behind an authenticated proxy server. How do I get Steam working from behind a proxy server?

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• Plymouth did not install properly

  - by David Starkey

  I was installing the plymouth manager in hopes of making a custom loading screen. While the terminal was working, my computer unexpectedly powered off. I can open up the manager and it appears to do what it is supposed to (minus the fact that I can't make my own theme) and the screen only shows on powering down. Anyway, all of the advice I have seen so far have resulted in errors and nothing getting fixed. I do not have permissions to simply select the folder and delete it for some reason and I have not been able to find out how to grant myself those permissions. I guess my question then is how do I get rid of the plymouth manager so I can reinstall it properly? Already tried: -Installation - http://www.noobslab.com/2011/11/install-plymouth-manager-and-change.html -Removal - How to remove Plymouth Boot Animation manager and keep the default boot screen -Permissions - How do I change my user permissions to edit /etc/apt/sources.list? -Theming Guide - http://brej.org/blog/?p=158

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• Inspiron N7110 Ubuntu 12.04 Poor WiFi Signal

  - by Joseph Risley

  Sorry if this is a repeat, I have been Googling possible answers and have not found one yet. I find my wireless signal is never 100%. Speed is fine, it's the actual signal strength that is the issue. I thought my router was the issue, but the problem was also present at the public library today. I asked the Windows and Mac users around me about their signal strength and they had full signal while mine was medium to low according to WiFiRadar. Is this a Dell problem (Realtek), or an Ubuntu problem I can fix in the terminal?

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• How to Recover an Encrypted Home Directory on Ubuntu

  - by Chris Hoffman

  Access an encrypted home directory when you’re not logged in – say, from a live CD – and all you’ll see is a README file. You’ll need a terminal command to recover your encrypted files. You should also back up your mount passphrase ahead of time – you may need this in the future. While eCryptfs normally decrypts your files with your login passphrase, the mount passphrase may be necessary if eCryptfs’s files become lost. HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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• mp3 codecs cannot be installed no software is actually installing

  - by joseph michore

  My Rythm box player cannot play mp3 and iget this error "GStreamer extra plugins cannot be installed on your computer type (i386) Either the application requires special hardware features or the vendor decided to not support your computer type" if i go to software center i get this error The repository may no longer be available or could not be contacted because of network problems. If available an older version of the failed index will be used. Otherwise the repository will be ignored. Check your network connection and ensure the repository address in the preferences is correct. in shot i have tried to dowload deb softs i still get the error above .so i have downloaded tar.gz and i have installed using terminal but i get another error of gcc c++ insanity check failure! i ask my self what i am supposed to do nothing is working nothing at all yet i have to run my bussiness help urgently before i collapse and choose to die!

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• svn checkout through proxy doesn't work

  - by Hoghweed

  I'm on an ubuntu 11.04 x64 I'm trying to svn checkout trough a proxy, I edited the servers file to correctly set the http proxy informations to correctly establish a connection, but I'm still having errors and the checkout it's not possible. this is the error: svn checkout http://75.101.130.236/svn/mspdd/ svn: OPTIONS of 'http://75.101.130.236/svn/mspdd': Could not authenticate to proxy server: ignored Kerberos challenge, ignored NTLM challenge, GSSAPI authentication error: Unspecified GSS failure. Minor code may provide more information: Credentials cache file '/tmp/krb5cc_1000' not found (http://75.101.130.236) Trying to access through browser works well but not from terminal.. any idea? thanks a lot

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• I attempted to install cuda drivers, and now almost everything is broken

  - by Nathan

  I tried to install CUDA tookit 5.0 on ubuntu 12.04 and the installation proceeded OK. After rebooting however, all I get is a terminal login. I've attempted to start the display manager with sudo start lightdm and it says all OK, but just hangs the prompt when it finishes loading without ever starting any display manager. sudo start gdm just flickers and goes back to the prompt. There is no network connection on the machine either. It usually connects to a wireless network with remembered credentials. What can I do to recover the machine?

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• Firefox 4.0 Error [closed]

  - by Nik

  Possible Duplicate: Firefox crashes very often - Attempting to load the system libmoon Hi, I am running ubuntu 10.10 and installed firefox 4.0 beta 10 using the ppa:mozillateam/firefox-next, by running the command sudo apt-get install firefox-4.0. However whenever I try running it, it starts up and then within 2 seconds it crashes without any warning. I also don't get the usual warning whether to send the crash report to firefox or not. So I tried running firefox-4.0 using the terminal and I get the following the error message. Attempting to load the system libmoon Segmentation fault What do it mean? And what do I do to fix this error? I really want to try the latest firefox beta in ubuntu.

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• Update errors on Xubuntu12.04

  - by Kris Everett

  I'm trying to install updates via the Update Manager, and I got this error: The Package system is broken Check if you are using third party repositories. if so disable them, since they are a common source of problems. Furthermore run the following command in a Terminal: apt-get install -f When I run apt-get install -f, I get: E: could not open lock file /var/lib/dpkg/lock - open (13: Permission Denied E: Unabvle to lock administration directory (/var/lib/dpkg/), are you root? What is wrong? How do I fix it? Why does this happen?

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• Flashplayer 11.1 on Ubuntu 12.04

  - by Courtney

  I am new to Ubuntu and I've visited pretty much every webpage that exists on the internet about how to install canonical Flashplayers. Ubuntu 12.04 comes with Adobe Flashplayer 11.2 but that is not the most recent version and Adobe no longer supports Ubuntu apparently. I have no idea how to install Flashplayer 11.1 via Terminal. I was able to find a site with canonicals (https://launchpad.net/ubuntu/+source/flashplugin-nonfree) but I have no clue where to go from there, though I've tried for approx. 4 hours to figure it out on my own. I am hoping someone could take me step by step through the exact code. For example, "download, then install file" is not specific enough since I am completely new to this. Please help!

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• How to play Silkroad online with Wine?

  - by IslamShalaby

  I'm new to Ubuntu, I have Ubuntu 12.04 LTS x64. I could not play Silkroad online, so i asked Google and I found that there's application named Wine, and I found some commands to run in the Terminal, to install it. I did all that successfully. Then I tried to start the game, via wine, and I got this error. Now I don't know what I should do. On Youtube I saw players that can play Silkroad on Ubuntu without problems. Check this out: http://www.youtube.com/watch?v=vY8AK8M43EQ Commands I used to install wine: sudo add-apt-repository ppa:ubuntu-wine/ppa sudo apt-get update sudo apt-get install wine1.5

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• Lynx "Alert!: Unable to connect to remote host."

  - by Deepend

  I'm pretty new to Ubuntu server. I'm running Distributor ID: Ubuntu Description: Ubuntu 12.04.4 LTS Release: 12.04 I have installed Lynx via sudo apt-get install lynx everything installed fine but when I try to connect to a website it just seems to time out. When I run lynx google.com it goes to a blank screen with a blue line at the bottom. There is yellow text on the line which says "Making HTTP connection to google.com" but it just sits there. Eventually after 5 - 6 minutes it just goes back to the normal terminal window If I run the below on its own lynx I get the same blue line with the same text "Making HTTP connection to google.com" but after 30 seconds or so it briefly turns to a red line with "alert!: lynx unable to connect to remote host" written on it. I have installed lynx locally and it works fine. Does anyone have any ideas?

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• How do I compare the md5sum of a file with the md5 file (that was available to download with the file)?

  - by user91583

  Images are available for a distro on http://livedistro.org/gnulinux/israel-remix-team-mint-12. I want to use the 32-bit version. I have downloaded the ISO file for the 32-bit version (customdist.iso). I have downloaded the md5 file for the ISO file (customdist.iso.md5). I want to calculate the md5sum of the ISO file and compare it to the md5 file. I can use the md5sum command to display within the terminal the calculated md5 for the ISO file. I have searched the web and can't find a way to compare the calculated md5 for the ISO file with the downloaded md5 file. So far, the closest I have come is the command md5sum -c customdist.iso.md5 from within the folder containing both the files, but this command gives the result: md5sum: customdist.iso.md5: no properly formatted MD5 checksum lines found Any ideas?

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• IBM Thinkpad 240 - Best way to boot from floppy to USB - Best Linux for 300 MHz 128 MB RAM 800x600 s

  - by zillion

  Mostly I still have that old 'ultraportable' laptop that is mostly like a pre-netbook era laptop and a friend and programmer needs a computer because the one he was using just broke and he has to wait until the new one arrive in 4-6 weeks ... This laptop has no LAN connection and CD-ROM so be prepared for a real challenge! All hardware is well supported on Windows XP (included drivers on the Windows XP CD) and on Linux out-of-the-box (but the screen need a special configuration.) Mostly any Linux that will work well with Skype (USB or regular headset), any MSN client and a text writer for code will do. What I have tested so far: Slitaz 2 don't boot because the floppy of GRUB4DOS don't see the USB drive (fully working and tested on my regular laptop), Damn Small Linux was working but was needing a special screen configuration that I don't remember (in the boot options of the floppy) and now I'm thinking about Puppy Linux that is seen to work totally out of the box with it but I will need an old Puppy version (1 or 2 I think) and the Wakepup floppy ... If you got some ideas to help or to try I'm open!

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• Issues when upgrading gnome-session

  - by Gabriel A. Zorrilla

  I'm having issues since yesterday after an upgrade. GNOME session got messed up somehow and now i cannot install further upgrades nor new apps. Here is what i got from terminal after doing the recommended apt-get install -f; (Reading database ... 166876 files and directories currently installed.) Preparing to replace gnome-session 3.0.1-0ubuntu1~build2 (using .../gnome-session_3.0.2-0ubuntu3~natty1_all.deb) ... Unpacking replacement gnome-session ... dpkg: error processing /var/cache/apt/archives/gnome-session_3.0.2-0ubuntu3~natty1_all.deb (--unpack): trying to overwrite '/usr/share/xsessions/gnome-shell.desktop', which is also in package gnome-shell 3.0.1-0ubuntu1~build1 Errors were encountered while processing: /var/cache/apt/archives/gnome-session_3.0.2-0ubuntu3~natty1_all.deb E: Sub-process /usr/bin/dpkg returned an error code (1) In var/log/apt/history.log, it says: Start-Date: 2011-05-29 17:56:16 Commandline: apt-get -f install Upgrade: gnome-session:amd64 (3.0.1-0ubuntu1~build2, 3.0.2-0ubuntu3~natty1) Error: Sub-process /usr/bin/dpkg returned an error code (1) End-Date: 2011-05-29 17:56:21 No idea what all this means.

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• Why won't cron run my sh script?

  - by Dmitry Narkevich

  Used gnome-schedule to create a script to set my headset as the fallback audio device because it keeps unsetting it when the headset gets disconnected or pc goes into sleep mode. Anyway, crontab is this: SHELL=/bin/sh PATH=/bin:/sbin:/usr/bin:/usr/sbin:/home/dmitry/bin * * * * * headsetfix /home/dmitry/bin/headsetfix is #!/bin/sh pacmd set-default-sink alsa_output.usb-Logitech_Inc_Logitech_USB_Headset_H540_00000000-00-H540.analog-stereo pacmd set-default-source alsa_input.usb-Logitech_Inc_Logitech_USB_Headset_H540_00000000-00-H540.analog-stereo It runs fine from the terminal. I've made sure it's chmodded to be executable, and "which headsetfix", run from cron, outputs "/home/dmitry/bin/headsetfix" so not sure what the problem is.

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• Package System Broken AMD FGLRX Unmet Dependencies

  - by fleamour

  I uninstalled propriety ATI driver to check if it would fix wrong Plymouth resolution. It did. But now I cannot reinstall either propriety drivers listed. Also package system has broken with this error: The package system is broken If you are using third party repositories then disable them, since they are a common source of problems. Now run the following command in a terminal: apt-get install -f The following packages have unmet dependencies: fglrx-amdcccle: Depends: fglrx but it is not installed Depends: libqtcore4 (= 4:4.5.3) but 4:4.8.1-0ubuntu4.1 is installed Depends: libqtgui4 (= 4:4.5.3) but 4:4.8.1-0ubuntu4.1 is installed What should I do?

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• There is no on button showing in gnome shell extension

  - by Murphy

  How to enable gnome shell extension?. When i click on gnome shell extension there is no ON button showing advanced settings -- shell extensions. In a youtube video I saw there is one ON button to enable shell extensions. i have allready installed gnome tweak tool and everything.. I have want to use user themes for gnome shell, but I am having troubles. I installed the user theme extension, but it doesn't appear to show up under the gnome tweak tool. To confirm that I have the user themes extension installed, here is the feedback I get when I try to install it through terminal again:

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• How do rsync from within a python script?

  - by Viswa

  I plan to move file from one system to another system. For this, I am using rsync command in linux terminal. It works fine. But I need to implement this command to python. I am very new in python, so I don't know the way of defining the rsync command. So please tell the steps to define it. This is my rsync command: rsync -avrz /opt/data/filename root@ip:/opt/data/file I need to implement this command in a python script.

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• How do I get a Canon imageClass MF4350d printer working?

  - by Dan

  I have an imageClass MF4350d printer/scanner/fax. I've tried to install the drivers. The printer is recognized in the system settings, but nothing prints. The scanner is working in simple scan. I tried following all of the troubleshooting suggestions in this thread with no success I downloaded this driver. I downloaded the Linux_UFRII_PrinterDriver_V230_uk_EN from Canon: Installation: 1st attempt: I installed the CNCUPSMF4350ZK.ppd file in the printer settings and moved the pstoufr2cpca file to /usr/lib/cups/filter. 2nd attempt: I followed forum advice of installing a fake gs-esp to tell the system that "gs-esp" is PROVIDED by the package "fake-gs-esp" I then converted the RPM sudo apt-get install alien sudo alien -k cndrvcups-common-2.20-1.x86_64.rpm sudo alien -k cndrvcups-ufr2-uk-2.20-1.x86_64.rpm I then installed the resulting .deb packages. Since I'm new to Linux, as much detail as possible in your suggestions would be very appreciated. I am still learning how to use the Terminal. Thank you very much!

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