ubun2^beta

I want to get rid of nx group and nx user from my ubuntu machine. How to remove user and group from my ubuntu desktop?

Recently upgraded from ubuntu 9.04 jaunty to 9.10 karmic koala. 9.10 ships with ext4 file system but i still notice that after the upgrade the partition still says as ext3. Looks like ext4 file system is more powerful and faster than ext3. Since i have already upgraded to 9.10, now how to change my partition from ext3 to ext4? Advance thanks for the help.

Please help me to install 3d desktop of compiz or beryl on my ubuntu machine. I have seen cool demos about it and excited to have it on my machine

I am looking for help to install ssh on my ubuntu jaunty 9.04 machine so that i can putty from my windows machine. please help

I recently installed firefox 3.5 but when i launch from Applications -> Internet -> Firefox Web Browser, it is still launching firefox 3.0 instead of the newly installed. Please suggest

I logged in as the primary user registered while installing ubuntu 9.04. After than i goto System > Administration > Users and Groups window. But to my surprise all the buttons Add User is disabled. I am pretty sure that i'm the root user. Is there anything else i need to do to make it enable?

Windows local dns hosts file is found at c:\windows\system32\drivers\etc. Is there a similar hosts file in ubuntu / linux and where to find the same?