I just started up an old laptop with an old version of ubuntu (11.04). It won't let me download applications (it throws some Untrusted sources error), so I'm trying to update to a new version.
In System > Administration I have discovered application called Update manager.
I have clicked Upgrade, but this crap has popped out:
I have no network problems. The only explanation is that the ubuntu update servers have changed their address while this computer was offline.
How can I troubleshoot this problem and proceed the upgrade?
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