Tu dois avoir un problème dans ton sources.list (/etc/apt/sources.list)
Le mien est le suivant :
deb http://fr.archive.ubuntu.com/ubuntu dapper main restricted universe multiverse
deb http://fr.archive.ubuntu.com/ubuntu/ dapper main restricted
deb-src http://fr.archive.ubuntu.com/ubuntu/ dapper main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://fr.archive.ubuntu.com/ubuntu/ dapper-updates main restricted
deb-src http://fr.archive.ubuntu.com/ubuntu/ dapper-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://fr.archive.ubuntu.com/ubuntu/ dapper universe
deb-src http://fr.archive.ubuntu.com/ubuntu/ dapper universe
## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://fr.archive.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu dapper-security main restricted
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted
# deb http://security.ubuntu.com/ubuntu dapper-security universe
# deb-src http://security.ubuntu.com/ubuntu dapper-security universe
# deb http://www.beerorkid.com/automatix/apt kubuntu main
Avec ça, j'arrive à avoir sous Adept (le Synaptic de Kubuntu) le paquet sun-java6-jdk
Attention, le #, c'est pour mettre en commentaire la ligne.
A+
Chaton.
