though i have connected to internet, when tried to update manager, it is showing this message. due to this, there is an error displaying on desktop at top right corner .. can any one help me to resolve this prblem.
Ok, try this solution:
- Go to Ubuntu Software Center, Chose Edit menu -> then chose Software Sources (last item in that menu). In software sources pop-up window under tab Ubuntu Software on bottom where is installable from CD-ROOM/DVD section uncheck Cd-room with Ubuntu 10.04 "Lucid Lynx".
Make sure on second tab Other Software that check-box for Cd-room with Ubuntu 10.04 "Lucid Lynx" is unchecked too.
sudo apt-get updateand problem should be solved.
- Now if you're using desktop edition of 10.04 Lucid Lynx note that the support for this version of Ubuntu stopped in April 2013, so update to newer version (if you like LTS versions 12.04 would be the choice). If you run server edition 10.04 Lucid Lynx is supported till April 2015
Hope It solves your problem.