KDE won't install

[Martin Hooper]

When I try installing KDE I get the following:

martin at Computer:~$ sudo aptitude install kde
Reading package lists... Done
Building dependency tree
Reading extended state information
Initializing package states... Done
E: Unable to correct problems, you have held broken packages.
E: Unable to correct dependencies, some packages cannot be installed
E: Unable to resolve some dependencies!
Some packages had unmet dependencies.  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.

The following packages have unmet dependencies:
   kde: Depends: kdesdk but it is not installable

It does it with both apt-get and aptitude.

Here is my sources.list

# deb cdrom:[Kubuntu 5.04 _Hoary Hedgehog_ - Release i386 (20050407)]/ 
hoary main restricted

deb http://gb.archive.ubuntu.com/ubuntu/ hoary main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ hoary main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://gb.archive.ubuntu.com/ubuntu/ hoary-updates main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ hoary-updates main restricted

## Uncomment the following two lines to add software from the 'universe'
## repository.
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://gb.archive.ubuntu.com/ubuntu/ hoary universe
deb-src http://gb.archive.ubuntu.com/ubuntu/ hoary universe

deb http://gb.archive.ubuntu.com/ubuntu/ hoary multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ hoary multiverse

deb http://security.ubuntu.com/ubuntu/ hoary-security main restricted
deb-src http://security.ubuntu.com/ubuntu/ hoary-security main restricted

# deb http://security.ubuntu.com/ubuntu/ hoary-security universe
# deb-src http://security.ubuntu.com/ubuntu/ hoary-security universe

deb http://ftp2.caliu.info/backports/ hoary-backports main universe 
multiverse restricted
deb http://ftp2.caliu.info/backports/ hoary-extras main universe 
multiverse restricted
# deb http://ftp2.caliu.info/backports/ hoary-backports-staging main 
universe multiverse restricted
# deb http://ftp2.caliu.info/backports/ hoary-extras-staging main 
universe multiverse restricted
deb http://server/repo/ packages/
deb ftp://ftp.kde.org/pub/kde/stable/3.4.1/kubuntu/ hoary-updates main