Ok, það gæti verið að is.ubuntu.com sé bara eitthvað að faila. Þú getur prófað að (gera backup af sources.list) og sett síðan þetta í staðinn
## Add comments (##) in front of any line to remove it from being checked.
## Use the following sources.list at your own risk.
deb http://archive.ubuntu.com/ubuntu dapper main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu dapper main restricted universe multiverse
## MAJOR BUG FIX UPDATES produced after the final release
deb http://archive.ubuntu.com/ubuntu dapper-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu dapper-updates main restricted universe multiverse
## UBUNTU SECURITY UPDATES
deb http://security.ubuntu.com/ubuntu dapper-security main restricted universe multiverse
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted universe multiverse
## BACKPORTS REPOSITORY (Unsupported. May contain illegal packages. Use at own risk.)
deb http://archive.ubuntu.com/ubuntu dapper-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu dapper-backports main restricted universe multiverse
## PLF REPOSITORY (Unsupported. May contain illegal packages. Use at own risk.)
deb http://packages.medibuntu.org/ dapper free non-free
## CANONICAL COMMERCIAL REPOSITORY (Hosted on Canonical servers, not Ubuntu
## servers. RealPlayer10, Opera and more to come.)
deb http://archive.canonical.com/ubuntu dapper-commercial main
Gert síðan
wget -q http://packages.medibuntu.org/medibuntu-key.gpg -O- | sudo apt-key add -
sudo apt-get update
Key'inn er fyrir PLF repositoryinn, sem er helvíti góður ef þér vantar hitt og þetta. Hefur komið mér ágætlega. Þú setur að sjálfsögðu bara # fyrir framan línuna ef þér lýst ekki á þetta :)
Þetta er tekið beint héðan:
http://ubuntuguide.org/wiki/Ubuntu_dapper#How_to_add_extra_repositories