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I am using ubuntu karmic koala. When I first logged in the sources.list file had an outdated list of repositories and so packages couldnot be reached. So I updated the sources.list to

deb karmic main  restricted
deb-src karmic main  restricted
deb karmic-updates main restricted
deb-src karmic-updates main  restricted
deb karmic universe
deb-src karmic universe
deb karmic-updates universe
deb-src karmic-updates universe
deb karmic multiverse
deb-src karmic multiverse
deb karmic-updates multiverse
deb-src karmic-updates multiverse
deb karmic-security main restricted
deb-src karmic-security main restricted
deb karmic-security universe
deb-src karmic-security universe
deb karmic-security multiverse
deb-src karmic-security multiverse

After this i could perform the update and could get the packages using synaptic manager. But now suddenly both the synaptic manager and command line tools throw the error

Could not resolve ''  
Could not resolve ''

Could this be a temporary issue with the server? (But ping to the server gives back responses). Pls come one tell me what the issue could me...

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migrated from Jan 30 '12 at 1:00

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Solved it! I am using VM for unix and there was some issue with the network connection in VM. Once it got reset everything is fine now. – Vijay Jan 29 '12 at 23:45
@Vijay, as this question is localised, please consider deleting it. – Paul Jan 30 '12 at 2:31

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