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I'm currently running a Vanilla Ubuntu 12.04 LTS that had Unity replaced with with gnome-shell. What I'd like to do is to do a do-release-upgrade that will install a specific flavor of Ubuntu (GNOME in this case) in 12.10?

I'd like to avoid doing upgrades that bring Unity back in, forcing me to clear it out again.

fossfreedom
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Logan Mayfield
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  • This wasn't meant to be a version skip question but an Ubuntu flavor skip question. I tried to clarify the question a bit more. – Logan Mayfield May 23 '13 at 17:26
  • What you're asking for is probably possible, but it will not involve do-release-upgrade. Any use of do-release-upgrade except to upgrade an earlier version of Ubuntu to a later one is unsupported and likely to fail and break things badly. – Eliah Kagan Aug 16 '13 at 15:00

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This is quite complicated, and there isn't an easy/quick way to do this. The best approach is to completely remove unity, install gnome3, then upgrade:

sudo apt-get purge unity unity-2d unity-2d-panel unity-2d-spread unity-asset-pool unity-services unity-lens-files unity-lens-music unity-lens-applications gir1.2-unity-5.0 unity-common indicator-sound indicator-power indicator-appmenu libindicator7 indicator-application indicator-datetime indicator-messages libnux-2.0-0 nux-tools libunity-misc4 unity-2d-common lightdm
sudo apt-get install ubuntu-gnome-desktop ubuntu-gnome-default-settings
sudo apt-get autoremove
sudo do-release-upgrade

I recommend you to do this in a text based environment, since the GUI binaries could be incomplete leaving the desktop unstable.

If you want to force unity to be uninstalled, you can put the package on hold:

echo 'unity hold' | sudo dpkg --set-selections

I'm not totally sure that do-release-upgrade respect on hold packages, due the lack of documentation.

Braiam
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  • do-release-upgrade is totally wrong (and dangerous) here, though not for reasons relating to held packages. do-release-upgrade will try to actually upgrade to the next Ubuntu release! sudo apt-get dist-upgrade is the correct command here (but run sudo apt-get update first and, ideally, sudo apt-get upgrade as well). This relates to my comment there. Counter-intuitively, dist-upgrade is correct here because you are not attempting to upgrade to a subsequent version of Ubuntu. – Eliah Kagan Aug 16 '13 at 14:58