[SOLVED] Trouble updating from 12.04 to 12.10

I've been trying to update to Ubuntu 12.10 to 12.04 but keep getting this error message:

W:Failed to fetch http://ca.archive.ubuntu.com/ubuntu/...source/Sources 404 Not Found [IP: 91.189.91.15 80]
, W:Failed to fetch http://ca.archive.ubuntu.com/ubuntu/...-i386/Packages 404 Not Found [IP: 91.189.91.15 80]
, E:Some index files failed to download. They have been ignored, or old ones used instead.

In terminal it says:
authenticate 'quantal.tar.gz' against 'quantal.tar.gz.gpg'
extracting 'quantal.tar.gz'
WARNING: Failed to read mirror file

. . .help? :shock: