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Following the guide I found here I am trying to upgrade my Ubuntu version from 10.10 to 12.04. As do-release-upgrade gave the error command not found I tried to install update-manager-core which results in this error

root@myserver:~# apt-get install update-manager-core
Reading package lists... Done
Building dependency tree... Done
E: Unable to locate package update-manager-core

Now I'm stuck, as nobody else on the web seems to have that issue

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Try running apt-get update, then apt-get dist-upgrade. – Grzegorz Żur May 21 '13 at 19:34
up vote 1 down vote accepted

Contrary to the experience he got upgrading of Ubuntu is only supported step by step - except with LTS-versions, where you can take the bigger steps LTS -> LTS.

In your case that means you would only be able to upgrade to 11.04 reliably. But all these releases are EOL, they are not supported any more. For this reason I suggest you back up the essential parts of your system and install 12.04 LTS.

What should you back up? The debian project has a very good description. It boils down to:

  • /home
  • /etc
  • /var/lib/dpkg
  • /var/lib/apt/extended_states
  • the output of dpkg --get-selections "*" (the quotes are important).
  • If you use aptitude to manage packages on your system, you will also want to back up /var/lib/aptitude/pkgstates.
  • data for any servers you have running
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