None of the other duplicate questions to this help. I've tried every single answer's suggestions. The offending issue is the xenial main source list.
http://ubuntu.mirror.neology.co.za/ubuntu xenial-updates/main amd64 Packages
Hash Sum mismatch
I've tried using every other source listed in the GUI
I've also tried
sudo rm -rf /var/lib/apt/lists/*
sudo apt clean
sudo apt update
I even tried resetting the sources to defaults using the USA repositories instead. Result:
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-amd64/by-hash/SHA256/3c1b1af4bfa7235f0e8ae7a098e784ed7c7d647fd23a52fc556a30e636f046e9 Hash Sum mismatch
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-i386/by-hash/SHA256/f6911df45698b03f845f8259c2eb7f39d94df9a9d6742d494a81842425314f0c
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/universe/binary-amd64/by-hash/SHA256/c609ff80c2b4fc56613d06bfabd69a9463fcf0f14ac405326542f1dc11b90a67
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/universe/binary-i386/by-hash/SHA256/e14cb503ee4b110c672bdce0db4f4273dc65cfe8a7d82ac94395c0847a6b57fe
E: Some index files failed to download. They have been ignored, or old ones used instead.
Still see the exact same error, and unable to do any update whatsoever, for several months now.
I'm guessing it's because of the "shutdown" of SHA/MD5 checksums. But then the repos should be starting to roll out something else already. That issue has been going on for at least a year already. If this is the case, it is simply unacceptable!
