Apologies if this has been answered recently, but
I'm getting several
errors while trying to update.
I was getting BADSIG errors, but those seem to be gone and "apt-get update"
completes, but now "apt-get dist-upgrade" fails with 404s:
Err
http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-v3.5.13/ubuntu/
precise/main kubuntu-default-settings-trinity all
4:3.5.13.2-0ubuntu12.04.0+0 404 Not Found
etc, etc.
If I put that URL into FF, I get to a mirror, so that part seems to be
working. Maybe a mirror out of sync?