problemer med installation af kpdf

Jeg har forsøgt at installere kpdg på ubuntu 7.10. Jeg benytter en terminal med koden "sudo apt-get install kpdf" og får følgende

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
kdelibs-data kdelibs4c2a libarts1c2a libartsc0 libaudio2 libavahi-qt3-1 liblua50
liblualib50 libopenexr2c2a libqt3-mt
Suggested packages:
fam khelpcenter nas libqt3-mt-psql libqt3-mt-mysql libqt3-mt-odbc
Recommended packages:
perl-suid kghostview libarts1-akode
The following NEW packages will be installed:
kdelibs-data kdelibs4c2a kpdf libarts1c2a libartsc0 libaudio2 libavahi-qt3-1 liblua50
liblualib50 libopenexr2c2a libqt3-mt
0 upgraded, 11 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0B/22,6MB of archives.
After unpacking 74,1MB of additional disk space will be used.
Do you want to continue [Y/n]? Y
dpkg: parse error, in file `/var/lib/dpkg/available' near line 25741 package `xclock':
`Depends' field, reference to `libice6':
bad version relationship ><
E: Sub-process /usr/bin/dpkg returned an error code (2)

Nogen der kan hjælpe mig med at løse problemet, for jeg forstå ikke helt ovenstående.