I am using ubuntu 11.10. I have tried with all options like
sudo apt-get update and
sudo apt-get upgrade I am getting problem for many software while installing in software center, shows error 'not found there isnt software called '------' in your sources.
also this is problem while installing gnome-shell.
sanket@sanket-Dell-System-XPS-L502X:~$ sudo apt-get install gnome-shell Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: gnome-shell : Depends: gjs (>= 1.29.18) but it is not installable Depends: libgjs0c (>= 1.29.18) but it is not installable Depends: caribou but it is not installable Depends: cups-pk-helper but it is not installable Depends: mesa-utils but it is not installable Recommends: gnome-themes-standard but it is not going to be installed Recommends: gnome-session-fallback but it is not going to be installed E: Unable to correct problems, you have held broken packages.
Is there any problem with Repository ,what should be done????