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This question already has an answer here:

actually I was updating from ubuntu 12.04 to 12.10 suddenly my machine got switched off then when i restarted the machine I am facing the following problems: 1. Even after doing shutdown it is not getting completely off. 2. I cannot update anything with update manager it is showing "Check Internet Connection" where I have a 15mbps broadband. 3. whenever I am trying to update using update manager it is telling me not all update are installed the when I am doing partial update it is showing a error message as follows:

failed to fetch

then when I am doing do-release-update it is showing no new releases. so I want to return back to ubuntu 12.04

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marked as duplicate by Mitch, Takkat, user68186, Jorge Castro, Seth Jun 7 '13 at 17:51

This question was marked as an exact duplicate of an existing question.

Rather than asking a new question we would like to encourage you to add additional information in an edit to your first question. Thank you :) – Takkat Jun 7 '13 at 10:52

I would have to say there are errors between the different version files. There may be other possibilities, but I would say a reinstall of the preferred version. Hope you had backups. Good Luck

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