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I upgraded from Ubuntu 11.10 to 12.04 using a bootable USB. After the upgrade, all non-default packages from 11.10 are gone.

For example, I did not have Chromium, Eclipse etc. Although, I could see these in the history in the "Ubuntu Software Center".

Is there any way I can retrieve all these packages (even reverting back to 11.10 is also fine with me)?

What could be a possible reason for this (We plan to upgrade a few more machines)?

During the upgrade process, I had unchecked the box which asked permission to look online for upgrade/packages. Co

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Look at this… – Olcay Ertaş Nov 12 '12 at 20:45

Most probably the sources.list has disabled the extension. That is usual for upgrades as some of the apps may not be supported yet on the new release. But from what i remember Chromium and Eclipse should not require there packages as they come added in ubuntu repos.

Check out here : vi /etc/apt/sources.list if you have the packages that you require.

The best option would be to find the package for 12.04 and use those.

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Thanks for the help, stevoo! I don't see the list of packages in the file you mentioned. But, I have anyway installed the needed packages manually and am good again :-). Though, it wasted about 2 hours of time unnecessarily. Thanks again! – Jagmal May 4 '12 at 10:49

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