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Fedora HowTo Linux Ubuntu

Team Fortress 2 Segmentation Fault – Steam for Linux

After getting invited to join the Steam Beta for Linux, (after weeks of using the bypass) I decided to get playing some TF2. After the long install and download I booted it up. The Value splash screen with the tap-guy loads and the menu begins to load, but once it has finished, the game closed and returned to my desktop.

So I tried again, but this time ran steam through terminal in order to get some error messages. The following is what I found to occur when the game crashed:

response: CrashID=bp-ca59d62f-9c2b-47e4-8cd9-9d0b02121212
/home/alex/Steam/SteamApps/username/Team Fortress 2/hl2.sh: line 72: 4811 Segmentation fault ${GAME_DEBUGGER} "${GAMEROOT}"/${GAMEEXE} "$@"
Game removed: AppID 440 "Team Fortress 2", ProcID 4811
saving roaming config store to 'sharedconfig.vdf'
roaming config store 2 saved successfully

To fix it, there’s a pretty simple solution. This is to add the option “-nojoy” to the launch options of the game:

  1. Right click Team Fortress 2 in the Library pane of Steam.
  2. Click “Properties”.
  3. Click “Set Launch Options”
  4. Add the following: -nojoy
  5. Hit OK and launch the game, everything should be working!

If you’re running Fedora, some folk have found another solution to this fix, if the previous doesn’t work:

sudo setsebool -P allow_execheap 1

Where it seems SELinux isn’t allowing the game to start for whatever reasons.

 

Categories
Arch Linux Fedora HowTo Linux Ubuntu

Heat Management in Linux

When you first switch from Windows or OSX to Linux, one of the things you’ll probably first notice (especially if you’re using a laptop) is that it can run considerably hotter than the alternatives. There are a few things you can do to remedy this, however. The following software packages help you keep track of and cool down your laptop/netbook, how much will depend per machine but my HP Pavilion dm1 goes from around 60-70degrees without these tools installed to around 50-60degrees and the same goes for my older Acer Travelmate which dropped from 70-80degrees to 60-70degrees. Hopefully this information will help you shave off 10degrees from your laptop, making it cooler, easier to use and hopefully extending its life a little too!

lm-sensors

First thing that you’re going to want to do is be able to see what the temperature readings of the components (that have temperature sensors) inside your computer/laptop. This can be done by installing lm-sensors:

sudo apt-get install lm-sensors

Now you’ll want to run the script which probes all the possible sensors in your laptop:

sudo sensors-detect

You’ll be asked if you want to scan for sensors and what not, follow the on-screen instructions, mostly just pressing enter, if YES is written in capitals this is the default answer and it will scan. After several times it’ll ask you if you want to save the changes, make sure you do and then you’re done.

Now you can see the temperature the sensors are reading by using the following command:

sensors
cpufreq

cpufreq is a utility which scales the frequency of the CPU, either by monitoring the systems status (if it needs more, it’ll get more) or by user controlled settings. This essentially underclocks the CPU while it isn’t in use, reducing power usage and thus heat.

Installation:

sudo apt-get install cpufreq

The best choice would be to set cpufreq to on-demand (default) or to power-saving. Alternatively, if you’re using a laptop or netbook let jupiter take care of it for you:

jupiter

Jupiter is a light weight power and hardware control applet for Linux. It is designed to improve battery life of a portable Linux computer by integrating with the operating system and changing parameters of the computer based on battery or powered connection.

Additionally, Jupiter provides quick access to some of the commonly needed hardware controls like screen output and resolution, WIFI, and bluetooth.

If you use Linux on a portable computer, let Jupiter take the effort out of going mobile.

By using this to intelligently control the CPU frequency when on battery and AC along with the tuning to the kernel and hardware, it can make a huge difference to the temperature expelled by your laptop.

Ubuntu 11:10 installation instructions: here

Graphics Card Drivers

If you have a dedicated graphics card in your laptop, you’ll also be better off installing the proprietary graphics drivers provided by the hardware vendor. While the open source ones do an awesome job of getting the card to work, more often than not they don’t include any control over the frequency scaling and keep the card running at max, along with all those other little features the card has, they’ll probably all always be running.

Nvidia : Link
ATI/AMD : Link

Categories
Command Line Fedora Linux Posts Ubuntu

Linux USB Errors with usb-creator-gtk “stdin: I/O error stdin: error 0 /init: line 1: can’t open /dev/sr0: No medium found”

After installing Ubuntu on a USB stick with the Ubuntu USB Startup Disk Creator (usb-creator-gtk) you might encounter an error such as the following:

stdin: I/O error
stdin: error 0
/init: line 1: can't open /dev/sr0: No medium found

This is actually a bug with the software and isn’t anything you’ve done wrong. It seems to be a bug that’s effecting users running Karmic, Lucid, Maverick and Natty so it’s a pretty wide spread issue.

The best way I have found to get around this issue is to install and run unetbootin to create live USBs. If you’re using linux it should be found in the usual place you can install things.

Installation:

Ubuntu/LinuxMint/Debian:

sudo apt-get install unetbootin

Fedora/OpenSuse:

sudo yum install unetbootin
Create a live USB:

To install a distro it’s pretty simple, either select it from the “Distribution” option and pick a distribution and version, UNetbootin will then actually download it and install it for you. Alternatively you can pick an Diskimage and browse for the ISO file you download (and would usually burn to a CD/DVD) and install from that. Select the USB Drive at the bottom and hit ok and it’ll install a bootloader, the system and you’ll be up and running in no time.

Persistence File:

If you wanted a persistence install which allows you to save files, settings and installed programs you’ll have to do a little manual work as it currently doesn’t support that option.

Go to http://unetbootin.sourceforge.net/diskimg/ and download one of the files (128mb.zip, 256mb.zip, or 512mb.zip) corresponding to the amount of persistent space you want (make sure the size of the persistent disk image is smaller than the free space you have on your USB drive).

You’ll then need to edit the syslinux.cfg file that was created by UNetbootin in the root of the directory (just open it with a text editor) you should see something similar to the following:

label unetbootindefault
menu label Default
kernel /ubnkern
append initrd=/ubninit file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash —

So on the line that starts “appen initrd=” you’ll want to add the option of “persistent”, it should then look like the following:

NOTE: WordPress changes my double dash at the end of the last line to a single long dash, this won’t work. It’s easiest just to add the final word before the double dash in the file, do not copy and paste this in to your file. If you do, you will get more errors.

label unetbootindefault
menu label Default
kernel /ubnkern
append initrd=/ubninit file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash persistent —

I added this line to all that used the “file=/cdrom/preseed/ubuntu.seed” option, since that’s the image that’s being opened and it should then change all options on the bootloader that will load the ubuntu install.

Categories
Arch Linux Fedora HowTo Linux Posts Ubuntu

Linux Media Players And Flash Not Stopping The Screensaver

It’s a pretty common problem, one which could be solved by pretty much the following sentence: ‘[Insert Linux Distro], [Insert Media Player] not stopping screen saver when playing videos.’ And, yeah, it’s very annoying. Something that should have been fixed thousands of releases ago, just like most common Linux problems. Luckily though there is a fix, it’s easy and it’s awesome.

Introducing: Caffeine, “An application to temporarily prevent the activation of both the screen saver and the “sleep” powersaving mode.” – https://launchpad.net/caffeine

Essentially what this program does is look for processes running on your machine (you can do this too, just run ‘ps -A’ in a terminal emulator to see a list of everything), so you set process names which the program should look out for, for example ‘vlc’ and when there is a process with this name Caffeine disables the screensaver, when the process stops the screensaver is re-enabled. It even comes with a little tray icon which allows you to manual enable or disable the screensaver/power management with a single click.

Installation (Ubuntu):
sudo add-apt-repository ppa:caffeine-developers/ppa
sudo apt-get update
sudo apt-get install caffeine
Usage:

You’ll be able to see if caffeine is running by the tray icon the first time you use it (this can be disabled in the settings).

Caffeine Running (Screensaver / Power Management Enabled)
Caffeine Running (Right Click Settings)
Caffeine Running (Screensaver / Power Management Disabled)
Adding Processes:

To add a process which will disable the screensaver from being activated, for example VLC so we can watch a movie without constantly having to wiggle the mouse:

First, run VLC (or whatever other media player you wish and just replace VLC for that for the other few steps)

Next, right click on the Caffeine tray icon and select “Preference”.

Click the “Add” button.

List of processes already disabling the screensaver, note Totem is added here.

You should be greeted by a list of the running processes, select the name of the media player (this case, vlc) if it isn’t there check under the “Recent Processes” tab or alternatively just write the command you would use to run this program from the command line.

Adding VLC to processes to disable the screensaver.

Finally click the “Add” button and close the preferences window, that pesky screensaver should no longer be bothering you!

Stopping Flash from enabling the screensaver:

Okay, this is actually really easy, if you’re using Chromium or Google Chrome or Firefox, you’ll just want to add the processes ‘npviewer.bin’ to list, you can use the above instructions to do so.

Categories
Linux Posts Web

Downloading all your Facebook Photos for Google Plus – In Linux

Okay so, with Google Plus just being released to a select few (and invites) you might be wanting to export all your Facebook photos, tagged and albums you’ve uploaded to Google+. There are several ways of going about this, a few webapps, apps and through Facebook itself, the problem is that most of these don’t work in Linux making it a little more tricky to do without switching to Windows or OSX or borrowing some ones laptop for a while.

Through Facebook Route:

This way is actually pretty easy, which came as a surprise to me since I would have though it be in Facebooks best interest to keep users there just because it’s too much hassle to change.

First head over to Facebook.com, login and make your way through the labrynth that is Facebook settings to
‘Account Settings’ > Next to ‘Download Your Information’ click ‘Learn more’ > click ‘Download’.

This way you’re going to have to wait for Facebook to process all your data, they’ll then send you an e-mail once it’s done to a download link. This is a compressed (ZIP) file which contains all your information from Facebook, in the Photos folder you’ll find all your pictures which can then be uploaded to Google Plus.

The problem with this way is that it can take a reasonable amount of time (a couple of days depending on how much information you have..) and I’ve had it fail on a couple of occasions.

Alternatively you can use the following:

The PhotoGrabber Option:

For this you’ll need a couple of dependencies installed, it’s a desktop app that downloads the files for you.

Install dependencies:

sudo apt-get install python python-tk

Install PhotoGrabber:

svn checkout http://photograbber.googlecode.com/svn/trunk/ photograbber-read-only
cd photograbber-read-only/
./pg.py

Once you’ve ran all that and the ./pg.py bit it should load up with the following:

Click Login and then proceed to login and allow PhotoGrabber to do its thing, once you’ve done that you’ll get to a screen similar to below with a code:

Copy and paste that into the PhotoGrabber window (you’ll need to use Ctrl+V no right click to paste) and then it’ll let you choose which photos to take. Once you’ve picked, hit Download and watch them download to the folder you specify. There’ll be a lot folders, one for each place you were tagged. Once it’s done you can upload them however you want to Google Plus otherwise just keep them.

Categories
Fedora HowTo Posts

Fedora 15 Post Installation Guide

Install RPM Fusion

su -c 'yum localinstall --nogpgcheck http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm'

http://rpmfusion.org/Configuration

Enable unsupported video and audio codecs

Get enhanced audio and video support in applications that rely on GStreamer:

sudo yum install gstreamer-plugins-ugly gstreamer-plugins-bad gstreamer-ffmpeg

Get enhanced audio and video support in applications that rely on xine backend:

sudo yum install xine-lib-extras-freeworld

http://rpmfusion.org/FAQ

Install Chromium Browser

Make a file called “fedora-chromium-stable.repo” in /etc/yum.repos.d/ and open:

sudo gedit /etc/yum.repos.d/fedora-chromium-stable.repo

Paste in the following, save and exit:

# Place this file in your /etc/yum.repos.d/ directory

[fedora-chromium-stable]
name=Builds of the "stable" tag of the Chromium Web Browser
baseurl=http://repos.fedorapeople.org/repos/spot/chromium-stable/fedora-$releasever/$basearch/
enabled=1
skip_if_unavailable=1
gpgcheck=0

[fedora-chromium-stable-source]
name=Builds of the "stable" tag of the Chromium Web Browser - Source
baseurl=http://repos.fedorapeople.org/repos/spot/chromium-stable/fedora-$releasever/SRPMS
enabled=0
skip_if_unavailable=1
gpgcheck=0

http://fedoraproject.org/wiki/Chromium

Install Flash

Download the YUM for Linux version from the adobe site – http://get.adobe.com/flashplayer/

Run the following in the folder you downloaded the file to:

su -c 'rpm -ivh adobe-release-i386-1.0-1.noarch.rpm'

Import the GPG key:

su -c 'rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-adobe-linux'

In 32bit run:

su -c 'yum install nspluginwrapper alsa-plugins-pulseaudio flash-plugin'

on 64bit run:

su -c 'yum install nspluginwrapper.{x86_64,i686} alsa-plugins-pulseaudio.i686 --disablerepo=adobe-linux-i386'
su -c 'yum install flash-plugin'

If you’re using Firefox, that should be all done but if you’re using Chromium you’ll need to open Firefox and play a video then close it and run the following:

32bit:

sudo ln -s /usr/lib/mozilla/plugins/libflashplayer.so /usr/lib/chromium-browser/plugins/libflashplayer.so

64bit:

sudo ln -s /usr/lib64/mozilla/plugins-wrapped/nswrapper_32_64.libflashplayer.so /usr/lib64/chromium-browser/plugins/nswrapper_32_64.libflashplayer.so

Close and re-open Chromium and head to YouTube to check that it’s working.

http://fedoraproject.org/wiki/Flash

Install Dropbox

Download and install the correct rpm for 32 or 64 bit from the Dropbox website – http://www.dropbox.com/downloading.

Follow this guide to remove the YUM errors you may encounter once the package is installed – http://alexsleat.co.uk/2011/05/24/how-to-fix-error-cannot-retrieve-repository-metadata-repomd-xml-for-repository-dropbox-please-verify-its-path-and-try-again/ .

Install VLC

sudo yum install vlc
Categories
Fedora HowTo Linux Posts

How To: Disable SELinux in Fedora

WARNING: by continuing following this guide you are putting your machine at risk by disabling the secuity features within SELinux, I strongly advise if you do not know what you are doing, stop and read up on the implications this action will have before continuing. Some information is avaible in the Fedora Wiki here .

Open up this file:

sudo gedit /etc/selinux/config

Change the line that looks like this:

SELINUX=enforcing

To this:

SELINUX=permissive

Save and reboot and it should be working, although again be warned this has disabled the security mechanism on your system. To re-enable this, simply do the same however change from permissive to enforcing and again reboot your machine.

Categories
HowTo Linux Posts

How To Fix: Error: Cannot retrieve repository metadata (repomd.xml) for repository: Dropbox. Please verify its path and try again

After installing dropbox from the RPM package availble on the site on a new Fedora 15 install, I was unable to use yum without coming across this error:

$ update
Loaded plugins: langpacks, presto, refresh-packagekit
http://linux.dropbox.com/fedora/15/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found : http://linux.dropbox.com/fedora/15/repodata/repomd.xml
Trying other mirror.
http://linux.dropbox.com/fedora/15/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found : http://linux.dropbox.com/fedora/15/repodata/repomd.xml
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: Dropbox. Please verify its path and try again

For some unknown reason dropbox repos dont seem to work past 13 so you’ll need to change the dropbox.repo file from detecting the current release to 13 like so:

Open the dropbox.repo file:

sudo gedit /etc/yum.repos.d/dropbox.repo 

Change the baseurl from $relesever to 13 like so:

Original:

[Dropbox]
name=Dropbox Repository
baseurl=http://linux.dropbox.com/fedora/$releasever/
gpgkey=http://linux.dropbox.com/fedora/rpm-public-key.asc

New:

[Dropbox]
name=Dropbox Repository
baseurl=http://linux.dropbox.com/fedora/13/
gpgkey=http://linux.dropbox.com/fedora/rpm-public-key.asc

Save and close and everything should be working, try using sudo yum update to check and the error should have gone away. If not give a reboot a try.

Categories
Blog Linux Posts

Linux Cheat Sheet

I wanted a cheat sheet which would display pretty nicely on my Kindle 3, I found a bunch of great ones but none were formatted well to fit on the Kindle so I went ahead and compiled my own from the most useful stuff I found on the others. I’ve put in commands for manipulating text files, searching, permissions, system info and a bunch of other stuff too so check it out if you’re in need of a reference page. I’ll update it on here as it gets updated too.

Download Here

Sources:

Categories
Blog Command Line HowTo Posts

HowTo: Find Recently Used Commands in Linux

One of my most used commands in Linux is the history command, it lists all your recent commands. The problem with this is you might have to scroll through hundreds before you get to one of any interest, so adding grep to search through these and bring back only relative one’s is great.

Give it a try (just change searchcriteria for what you want like apt-get or tar):

history | grep searchcriteria

Manual pages: