Thanks for the reply.
Actually the problem was because of some broken packages.
I did this-opened up synaptic package manager and selected "Custom Filters"
(bottom left) then "Broken" that displays broken packages with a red box, I
uninstaled them, now it works fine.
** Changed in: ubuntu
Status: New => Fix Committed
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Can't install 'ubuntu-desktop'
https://bugs.launchpad.net/bugs/308260
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