I'm running an official mirror (http://ftp.caliu.cat) and i've been struck with this issue too when upgrading from precise to trusty.
I've been trying to figure out whats the problem since this afternoon and this is the summary: * changed the way we updated our mirror from our own rsync recipe to the ubumirror package (no change); * used https://github.com/marblenix/fix-apt-mirror-hash-sum-mismatch to make sure that the files in our mirror were up to date (no change); * downloaded the offending files with wget from both archive.ubuntu.com and ftp.caliu.cat, compared them and were exactly the same; * search our nginx log files for errors: the only surprise was that offending files are downloaded as partial content (http 206) and sometimes ranges fail (with http 416); * figured out that the only difference between country level archives and our own is that ours uses nginx and the others apache; * it happens that mirror.as29550.net uses nginx too. I'm not sure yet, but i'm afraid that there's been some change in the way apt manages files (trying to fetch partial content in some cases) and some servers fail to work correctly making apt complain about the network. Does this makes any sense? ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1311652 Title: Error during update To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1311652/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
