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When installing GNOME3 on natty, I got this at the Update Manager. All the items related to GNOME can not be checked.

I'm also trying to install via command line, but the download speed of the dist-upgrade is really slow.

What is the cause of the warning? And how to handle it?

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Can you try the following first?

sudo apt-get update
sudo apt-get upgrade

Start by closing the Update Manager first...

I am suspecting that the update part is not properly completed.
If that is the case, just doing the update part successfully (without errors) on the command line and then trying with Synaptic or the command line upgrade should work without further errors. Download speed is a different problem tho.

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I never trusted Dist-upgrade... Every time a new version of Ubuntu comes out that I would like to try (& I have the time), I just backup what is important, and do a fresh install. – Alex Sep 9 '11 at 8:48
@Alex, actually ditto :-), and its an easy and fast procedure. I even keep a backup of the apt-archives to replay on the new installation fast. – nik Oct 13 '11 at 10:35

I was having a very similar problem. My update manager would always report "Not all updates could be installed". Whenever I tried this:

sudo apt-get update && sudo apt-get upgrade

I got this:

The following packages have been kept back:
  0ad 0ad-data ginn libgrip0 linux-generic linux-headers-generic linux-image-generic touchegg

Then I did:

sudo apt-get purge touchegg 0ad 0ad-data

Because I knew I didn't need those anyway.

After that the command line was still giving me the same as above. Then, for no particular reason, I did System Settings > Details and clicked the Install updates button. For my surprise it installed all those packages without any issues..

Very weird.. hope this helps.

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