Hello

I am using ubuntu 10.10 currently and I was trying to upgrade to higher version but the update manager is not showing option for that. I also tried it using the terminal (sudo apt-get upgrade) and it is not working.

Also earlier I was having problem with some PPA to update the system before upgrading it.
It was related to the following PPA and I unchecked it from the Software Sources
http://ppa.launchpad.net/mozillateam...-stable/ubuntu

But now there is no option of upgrading and from terminal also it is not working.

Please help me in upgrading to higher versions.

Thank you