I tried upgrading from Maverick to Natty, but the fetching of packages failed, when I tried to do a partial upgrade. It's displaying fetching complete, but actually it fails and I get following errors: Could not download the upgrades The upgrade has aborted. Please check your Internet connection or installation media and try again. All files downloaded so far are kept. Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/main/m/mesa/libgl1-mesa-dri_7.10.1~git20110215.cc1636b6-0ubuntu1_i386.deb 404 Not Found I can't post more hyperlinks as per restrictions. Please help, I am relatively new to Ubuntu and am loving it. Thanks in advance!