I run Ubuntu 7.10 on an Asus P5B-MX system of which I use the onboard LAN. My problem is I guess the driver or the configuration: Mozilla has an internet connection but nothing else seems to, for example when trying to update or install packages and programs it errors as soon as something needs to be downloaded.
I've got the linux driver straight from Asus' site though i can't find any TAR file in the download :S
Anyway, if some one knows the (obvious?) thing I'm doing wrong, please give my a (link to a) step by step guide.

Tnx in advance.

Can you be more specific - what errors?
Can you post your /etc/apt/sources.list

I tried using sudo -apt-get update but after some "ign [location]" passed it gives an error:

Could not resolve 'nvidia.limitless.lupine.me.uk'
...
404 Not Found [IP: 195.114.19.35 80]
---
E: Some index files failed to download, they have been ignored, or old ones used instead.

Also when adding programs through the standard applications-add/remove... i can't download anything "list of apps not available" when i reload i get a message box stating none of the repository indexes could be downloaded, all with " could not resolve ip" or 404 errors.

Ooh... I just read the sources.list but every "# Line commented out by installer because it failed to verify:"
guess that's kind of the problem, but here it is anyway. (sorry if i shouldn't be posting the entire file here but i don't know what else :s )

/etc/apt/sources.list:

deb cdrom:[Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016)]/ gutsy main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

# Line commented out by installer because it failed to verify:
# deb http://nl.archive.ubuntu.com/ubuntu/ gutsy main restricted
# Line commented out by installer because it failed to verify:
# deb-src http://nl.archive.ubuntu.com/ubuntu/ gutsy main restricted

## Major bug fix updates produced after the final release of the
## distribution.
# Line commented out by installer because it failed to verify:
# deb http://nl.archive.ubuntu.com/ubuntu/ gutsy-updates main restricted
# Line commented out by installer because it failed to verify:
# deb-src http://nl.archive.ubuntu.com/ubuntu/ gutsy-updates main restricted

## 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.
# Line commented out by installer because it failed to verify:
# deb http://nl.archive.ubuntu.com/ubuntu/ gutsy universe
# Line commented out by installer because it failed to verify:
# deb-src http://nl.archive.ubuntu.com/ubuntu/ gutsy universe
# Line commented out by installer because it failed to verify:
# deb http://nl.archive.ubuntu.com/ubuntu/ gutsy-updates universe
# Line commented out by installer because it failed to verify:
# deb-src http://nl.archive.ubuntu.com/ubuntu/ gutsy-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.
# Line commented out by installer because it failed to verify:
# deb http://nl.archive.ubuntu.com/ubuntu/ gutsy multiverse
# Line commented out by installer because it failed to verify:
# deb-src http://nl.archive.ubuntu.com/ubuntu/ gutsy multiverse
# Line commented out by installer because it failed to verify:
# deb http://nl.archive.ubuntu.com/ubuntu/ gutsy-updates multiverse
# Line commented out by installer because it failed to verify:
# deb-src http://nl.archive.ubuntu.com/ubuntu/ gutsy-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://nl.archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse
# deb-src http://nl.archive.ubuntu.com/ubuntu/ gutsy-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 gutsy partner
# deb-src http://archive.canonical.com/ubuntu gutsy partner

# Line commented out by installer because it failed to verify:
# deb http://security.ubuntu.com/ubuntu gutsy-security main restricted
# Line commented out by installer because it failed to verify:
# deb-src http://security.ubuntu.com/ubuntu gutsy-security main restricted
# Line commented out by installer because it failed to verify:
# deb http://security.ubuntu.com/ubuntu gutsy-security universe
# Line commented out by installer because it failed to verify:
# deb-src http://security.ubuntu.com/ubuntu gutsy-security universe
# Line commented out by installer because it failed to verify:
# deb http://security.ubuntu.com/ubuntu gutsy-security multiverse
# Line commented out by installer because it failed to verify:
# deb-src http://security.ubuntu.com/ubuntu gutsy-security multiverse
deb http://nvidia.limitless.lupine.me.uk/ubuntu edgy stable
deb http://ubuntu.beryl-project.org gutsy main