To mount an ISO file to a folder on ubuntu, open shell and run the command:
sudo mount -t iso9660 -o ro,loop=/dev/loop0

To mount an ISO file to a folder on ubuntu, open shell and run the command:
sudo mount -t iso9660 -o ro,loop=/dev/loop0

If you cannot run Youtube videos on ubuntu firefox, then you miss the flash plugin, simply install it:
sudo apt-get install flashplugin-nonfree

To solve the arabic encoding problem in VLC which appears in loading arabic subtitles for a movie, simply install the package: libfribidi0_0.20-1_i386.deb
Find the package here: http://ubuntuforums.org/showthread.php?t=485020
http://ubuntuforums.org/attachment.php?s=f46bc2f1415ad5d9587ab3366c464e3f&attachmentid=39554&d=1186008124

Add the following lines to your /etc/apt/sources.list:
deb http://ppa.launchpad.net/siretart/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/siretart/ppa/ubuntu jaunty main
Import the appropriate GPG key (port 11371 on your firewall must be open to use the keyserver):
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xce90d8983e731f79
See https://help.launchpad.net/Packaging/PPA#Adding%20a%20PPA%20to%20your%20Ubuntu%20repositories for additional information how to add GPG keys to your system.
Install the driver:
$ sudo apt-get update
$ sudo apt-get install xserver-xorg-video-intel-2.4
Now you should be set. Restart X by running “sudo /etc/init.d/gdm restart” in a terminal and see if the graphics performance from intrepid is restored.
Do I need to change my xorg.conf file? ==> May not work. Situation not improved without xorg.conf change??
Rolling back
If the driver does not work for you, or is not better, you should rollback to the original Ubuntu one. Remove the two lines from /etc/apt/sources.list again, and install the original one again:
$ sudo apt-get install xserver-xorg-video-intel
If X.org does not start at all, you should change to a text terminal by pressing Ctrl+Alt+F2, logging in, and use “sudo nano” to edit /etc/apt/sources.list. After installing xserver-xorg-video-intel, restart the computer with “sudo reboot”.





Recently, I installed Ubuntu 8.10 on my notebook which contains RTL8187B WLAN card. unlike previous versions of Ubuntu which don’t detect such card, 8.10 detected the card, and WLAN worked very well. But I noticed that the range of the WLAN is very short, and after very few meters from the router, there is no traffic. After some long search, here is the solution that worked with me:
1- gksu gedit /etc/rc.local
2- Add the following line to rc.local before exit 0
iwconfig wlan0 rate 5.5M fixed
3- Reboot
Of course there are some other solutions based on ndiswrapper or the modified RTL8187B driver, but I found the above solution powerful and easy and no big change happened in the system.

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(gecko:6422): Pango-WARNING **: failed to create cairo scaled font, expect ugly output. the offending font is ‘Arial 12′
Segmentation fault (core dumped)
Solution:
This problem is caused by permissions of the newly installed fonts, so just resetting permissions using the following command:
sudo chmod -Rv 775 /usr/share/fonts/

Installing Core Microsoft fonts:
sudo apt-get install msttcorefonts
To make them work in X-windows, you may also want to install x-ttcidfont-conf if it’s not already installed:
sudo apt-get install x-ttcidfont-conf
Another way to install fonts based on existing fonts folders inside Windows:
Gain root privileges:
sudo bash
Make a directory to store the fonts:
mkdir /usr/share/fonts/truetype/msfonts
Find the fonts on your windows partition, for me this was /media/sda1/Windows/Fonts
copy the fonts over:
cp /media/sda1/Windows/Fonts/*.ttf /usr/share/fonts/truetype/msfonts
Re-create the font cache:
fc-cache -f -v

