Comment 21 for bug 24234

Thanks Michael for reporting the problem and Anthony for your detailed analysis. It looks like there is a problem with the timestamps on the server. If you get this error, can you please comment out all sources but the failing ones and then run:
$ sudo apt-get update -o Debug::Acquire::http=True 2>/tmp/apt-http.log

and attach the result? I suspect for some reason your local copy of the release/release.gpg file is newer than the version on the server and that causes apt to assume that there is no new version for download (this happend in the past).

Thanks,
 Michael