When I attempt to upgrade from 10.04 to 12..., I get the following message(s) at the point of 'setting up files': (YadYada = www.):
W:Failed to fetch YadaYada us.archive.ubuntu.com/ubuntu/dists/intrepid-backports/main/source/Sources 404 Not Found [IP: 91.189.91.13 80]
, W:Failed to fetch YadaYada us.archive.ubuntu.com/ubuntu/dists/intrepid-backports/restricted/source/Sources 404 Not Found [IP: 91.189.91.13 80]
, W:Failed to fetch //us.archive.ubuntu.com/ubuntu/dists/intrepid-backports/universe/source/Sources 404 Not Found [IP: 91.189.91.13 80]
, W:Failed to fetch //us.archive.ubuntu.com/ubuntu/dists/intrepid-backports/multiverse/source/Sources 404 Not Found [IP: 91.189.91.13 80]
, E:Some index files failed to download. They have been ignored, or old ones used instead.
Suggestions would be appreciated, as the Chromium (and fails with adobe Flash) are becoming frequent.
Thanking you in advance,
Tatter
(P.S.; as this site chokes on more than two links mentioned in this post; hence: YadaYada).