This just happened to me running the karmic prerelease.
It chose http://mirror.math.ucdavis.edu/ubuntu/dists/ which contains no karmic packages, and so I get a bunch of 404 errors.
This just happened to me running the karmic prerelease.
It chose http:// mirror. math.ucdavis. edu/ubuntu/ dists/ which contains no karmic packages, and so I get a bunch of 404 errors.