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I was updating to Ubuntu 12.04 and I lost my wireless connection. I turned off my computer and got to a better connection and now my "Update Manager" does not prompt for the upgrade.

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You were in the middle of the upgrade process? – izx May 21 '12 at 20:34
Yes, it had already started downloading for at least an hour... – Charity May 21 '12 at 22:04
What is the output of lsb_release -a? – Jobin Mar 10 at 10:38

2 Answers

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Make sure that all possible updates are installed using update-manager.

After that you can trigger the update-manager with the dist-upgrade option which should start it showing the upgrade option to 12.04. Do it like this:

  1. Press Alt+F2
  2. Type "update-manager --dist-upgrade" and press enter

If that doesn't work it might be that all your repositories are already changed to the new distribution. You just need to finalize the installation:

  1. Press Alt+F2
  2. Type "gnome-terminal" and press enter
  3. In the terminal window type "sudo apt-get update; sudo apt-get upgrade"
  4. Enter your password when prompted
  5. Accept the proposed update

Please let us know if one of these ways worked for you.

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When I tried it the first way, it says "Your system is up to date" When I tried it the second way it just said 0 upgraded. What happened was it was partially installed and when my internet connection got lost, it said it would save what had been upgraded so far. – Charity May 21 '12 at 21:53
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Try sudo apt-get dist-upgrade; if your system is fully updated before you type that, it SHOULD upgrade to the newer version.

Uh, good luck; this usually works, but not every time.

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no, sudo apt-get dist-upgrade does not upgrade Ubuntu to a higher version. See manpages.ubuntu.com/manpages/precise/en/man8/apt-get.8.html – bodhi.zazen Mar 4 at 2:13

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