Are you still having trouble with this file? If you still have this file: /var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_bionic-backports_Contents-i386.gz can you determine from looking at it if it looks remotely close to what was expected?
The usual cause of this problem is ISP-deployed transparent caches, it might be worth looking into various websites for "am I behind a proxy?". I've seen apt-cacher-ng cause this problem too, but that was seven years ago. The version of this file I retrieved a few minutes ago from all four archive mirrors that I can reach were identical, and matched what the Release file says they should match. Thanks ** Information type changed from Private Security to Public Security ** Changed in: apt (Ubuntu) Status: New => Incomplete ** Changed in: update-manager (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1880222 Title: ubuntu bionic-backports Hash Sum mismatch To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1880222/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs