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I installed Ubuntu and removed some default Ubuntu packages such as unity and scroll overlay. Will this packages be installed again if I upgrade to the next release of Ubuntu?

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One of the more common areas where an upgrade fails is when the ubuntu-desktop meta package has been removed when uninstalling various packages.

Most often you get the error unable to calculate.

You should always reinstall the ubuntu-desktop metapackage before the upgrade. This will reinstall all ubuntu-desktop dependencies described in the packages wiki

sudo apt-get install ubuntu-desktop

You will have to remove any packages afterwards then was reinstalled but you no longer want.

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Thanks for the answer. I have to look now for the method of upgrading Ubuntu without the need to ubuntu-desktop package. –  user26181 Dec 5 '11 at 0:53
    
I have know found the solution of upgrading Ubuntu without ubuntu-desktop package. Here is the link ubuntuforums.org/archive/index.php/t-1605468.html –  user26181 Dec 5 '11 at 0:55

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