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I can update my Ubuntu to the new LTS version. As you can think, its not a highly important server since I run 13.10 (not a LTS version). Anyway - I actually want to upgrade my server, but would like to be able to revert this upgrade.

I would be able to reinstall Ubuntu 13.10 and overwrite it with my backup. But I want to know if there is a more comfortable way to do this. TBH I guess theres no command as undo-release-upgrade but I thought it would be worth to ask for it.

This is my current daily backup script

tar cvpzf $backup_file --exclude=/proc --exclude=/lost+found --exclude=$backup_file --exclude=/mnt --exclude=/sys --exclude=/media --exclude=/tmp /
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If you're using LVM or btrfs, you could take snapshots. But really, upgrades are one-way... You need a test environment (could be as simple as a VM somewhere) so you can test upgrading. –  derobert Apr 19 at 5:06
    
Debian does not support downgrades, and therefore Ubuntu does not either. –  Faheem Mitha Apr 19 at 8:16

2 Answers 2

up vote 1 down vote accepted

As Faheem said in comments, you can't revert/downgrade the version of Ubuntu once you upgrade it. The only possibility is to do an image of the system, or complete backup and then installing it over. You can also test in a VM as derobert suggest.

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I think you could use Clonzilla to backup the disk/partition. Then just restore the created image to go back to your previous config if something is wrong with 14.04. Best

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