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After installing GIMP 2.7 from a repository, i lost Ubuntu-desktop and GNOME Shell. Now I keep switching XFCE, OPENBOX and E17. But I still miss Ubuntu. When I try to install ubuntu-desktop, i get the following error

ubuntu-desktop:
 Depends: eog but it is not going to be installed
 Depends: unity-2d but it is not going to be installed
 Recommends: libgail-3-common but it is not going to be installed
 Recommends: libgail-common but it is not going to be installed
 Recommends: totem but it is not going to be installed
 Recommends: totem-mozilla but it is not going to be installed

When I try to install GNOME Shell, i get the following error

gnome:
 Depends: gnome-core but it is not going to be installed
 Depends: gnome-games but it is not going to be installed
 Depends: totem-mozilla but it is not going to be installed
 Depends: totem-plugins but it is not going to be installed

I actually fixed other keys but this particular one wont get fixed. I want to get back Ubuntu-desktop and GNOME Shell back without formatting.

W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures were invalid: BADSIG 8CA7A6E8E4FA953A Launchpad 0 A.D.

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closed as too localized by Jorge Castro, Bruno Pereira Mar 11 '12 at 11:20

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

1  
That doesn't seem to have anything to do with keys, from what you show. It's more likely that there is a conflict with the packages you installed from the ppa. –  Jo-Erlend Schinstad Mar 8 '12 at 7:44

2 Answers 2

Make a backup of your whole /etc/apt directory.

Now go into the software sources control panel, and disable everything but the main archive.

Now from a terminal, do

sudo apt-get update
sudo apt-get install -f ubuntu-desktop

If that doesn't work, paste the whole error.

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The following packages have unmet dependencies: ubuntu-desktop : Depends: eog but it is not going to be installed Depends: unity-2d but it is not going to be installed Recommends: libgail-3-common but it is not going to be installed Recommends: libgail-common but it is not going to be installed Recommends: totem but it is not going to be installed Recommends: totem-mozilla but it is not going to be installed E: Unable to correct problems, you have held broken packages. –  prasadkumar013 Mar 9 '12 at 18:38
up vote 0 down vote accepted

Finally had to format and reinstall my system. I installed Linux Mint and installed Unity over it(saves me the time for downloading the multimedia codecs and GNOME Shell;)). Got back the Ubuntu Unity greeter back and now feels like iam back in Ubuntu.

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