Comment 9 for bug 273015

I have similar problem with ubuntu 8.04. System has kde4 installed, but there
are problems. So I tried to install gnome:

sudo apt-get install gnome
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.

Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  gnome: Depends: gnome-desktop-environment (= 1:2.20.2.2) but it is not going to be installed
E: Broken packages

sudo apt-get install gnome-desktop-environment
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.

Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  gnome-desktop-environment: Depends: gnome-keyring-manager (>= 2.20.0) but it is not installable
E: Broken packages

sudo apt-get install gnome-keyring-manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package gnome-keyring-manager is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package gnome-keyring-manager has no installation candidate