Ubuntu 8.10

[jack_the_nimble]

apt-get install kde4
Reading package lists...
Building dependency tree...
Reading state information...
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:
  kde4: Depends: kde4-core (>= 3.3~gutsy1~ppa1) but it is not going to be installed
        Depends: kde4-amusements (>= 3.3~gutsy1~ppa1) but it is not going to be installed
        Depends: kdeartwork-kde4 (>= 4:4.0.0) but it is not going to be installed
        Depends: kdenetwork-kde4 (>= 4:4.0.0) but it is not going to be installed
        Depends: kdeutils-kde4 (>= 4:4.0.0) but it is not going to be installed
E:Broken Packages

ProblemType: Bug
Architecture: i386
Dependencies:

DistroRelease: Ubuntu 8.10
Package: kde4 None [modified: /var/lib/dpkg/info/kde4.list]
PackageArchitecture: all
ProcEnviron:
 PATH=/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/username/bin
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: meta-kde4
Uname: Linux 2.6.27-7-generic i686
UnreportableReason: This is not a genuine Ubuntu package

The repository is http://ppa.launchpad.net/kubuntu-members-kde4/ubuntu

[Terence Simpson (tsimpson)]

The Kubuntu Members KDE4 PPA is only for Hardy (8.04) not Intrepid (8.10). You should disable that repository.
If you want to install KDE 4 from Ubuntu 8.10 just install the "kubuntu-desktop" package.