ubun2^beta

I ran ulimit -n and it is current showing as 1024. I want to increase my file limit from 1024 to 4084. So, i tried running the following command
 
sudo ulimit -n 2048
 
but i get the following error
 
sudo: ulimit: command not found
 
How to increase the file limit from 1024 to 4084. Any help will be appreciated.
 

I recently bought magic jack but they provided software only for windows. Is there a magic jack software available for linux? Or anybody got any luck running the windows version of the magicjack software in ubuntu?

Bought a canon laser printer MF4350d recently. Tried to add the printer using System - Administration - Printing. Unfortunately it doesnt have a driver for it. Also it tried searching, but no luck. Did anybody successfully got this printer installed and configured to work with ubuntu 9.10 karmic koala?

Downloaded the cool aurora theme for ubuntu linux and inorder to use it, i need to install the aurora engine. While running ./configure on aurora engine gave me the following error...
 
configure: error: GTK+-2.10 is required to compile aurora
 
How to install GTK+-2.10, so that i can compile and install the aurora engine?

Some of the 3gp files i download on the net doesn't work with the players in ubuntu. I am not hearing any sound. Some are erroring out due to codec issues. I tried playing with Movie Player, Banshee Media Player, VLC Media player, etc... Is there any good free 3gp player available for download that can any 3gp file?

I am getting the following error while running update.php on the drupal site 
 
Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 1 bytes) in /var/www/includes/database.inc on line 102
 
How to increase php memory size?

Coming from a windows background and recently tried ubuntu 9.10 and started liking it. On windows it was really easy copying files between windows machines.
 
Now moving to the ubuntu, please help file directory copying in linux. I like to know how to copy between two ubuntu machines.

The other day i was looking at a demo of a seo methodology online and the way they presented was pretty cool. So, i was caught into the way of mind mapping the ideas. I would appreciate if someone could point me to a free mind mapping software that is available free of cost and most preferebly open source. thanks for the help.

While installing ubuntu 9.10 i set a long hostname and it is hard to keep track of it while connecting from other machines. Please help how to change hostname?

I would like to know which is most widely used linux distribution in india. I am using ubuntu.