The good news is that the LinuxMint 8, Ubuntu, and Canonical partner repositories are now working! However, you will probably need to modify your sources list. Here is my working sources.list as tested today and I even got the update for Acrobat reader 9.3 from the Partner repository. sources.list contents: (I have also attached my sources.list file but you must be logged in to see it and be sure to do a mv on it to remove the _.txt extension.)
## -----------------------
## LINUX MINT REPOSITORIES
## -----------------------
## +++ Linux Mint 7 helena (stable) +++
deb http://packages.linuxmint.com/ helena main upstream import
## multiverse universe
## +++ Backports (not as stable) +++
# deb http://packages.linuxmint.com/ helena backport
## +++ Community (not as stable) +++
# deb http://packages.linuxmint.com/ helena community
## +++ Romeo (unstable) +++
# deb http://packages.linuxmint.com/ helena romeo
## +++ Source Repositories +++
# deb-src http://packages.linuxmint.com/ helena main upstream import
# deb-src http://packages.linuxmint.com/ helena community
# deb-src http://packages.linuxmint.com/ helena backport
# deb-src http://packages.linuxmint.com/ helena romeo
# deb cdrom:[Ubuntu 9.10 _Karmic Koala_ - Release amd64 (20091027)]/ karmic main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu/ karmic main restricted
deb-src http://archive.ubuntu.com/ubuntu/ karmic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu/ karmic-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu/ karmic-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ karmic universe
deb-src http://archive.ubuntu.com/ubuntu/ karmic universe
deb http://archive.ubuntu.com/ubuntu/ karmic-updates universe
deb-src http://archive.ubuntu.com/ubuntu/ karmic-updates universe
## 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
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu/ karmic multiverse
deb-src http://archive.ubuntu.com/ubuntu/ karmic multiverse
deb http://archive.ubuntu.com/ubuntu/ karmic-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu/ karmic-updates multiverse
## 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://us.archive.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu karmic partner
deb-src http://archive.canonical.com/ubuntu karmic partner
deb http://security.ubuntu.com/ubuntu karmic-security main restricted
deb-src http://security.ubuntu.com/ubuntu karmic-security main restricted
deb http://security.ubuntu.com/ubuntu karmic-security universe
deb-src http://security.ubuntu.com/ubuntu karmic-security universe
deb http://security.ubuntu.com/ubuntu karmic-security multiverse
deb-src http://security.ubuntu.com/ubuntu karmic-security multiverse