Hash Sum Mismatch Local Mirror

I'm currently running Ubuntu 20.04 and a local mirror server after following this process. Also, this machine is a VM running on a 2012R2 Hyper-V cluster.

I'm finding that a server trying to do an update to it runs into a hash sum mismatch error after the nightly cron job runs. If I remove all the data in the archive.ubuntu.com directory in /var/www/html/ubuntu/mirror, then rerun the /usr/bin/apt-mirror and cnf.sh script, then updates work as normal. However, after the cron job runs, everything stops working and the hash sum mismatch comes back again.

As far as I can see, the issue lies with the CNF files. I've made sure there is ample space on the server. I've checked the cnf.sh file and made sure only the amd64 files are downloading.

Tried running these commands to troubleshoot as well:

sudo rm -rf /var/lib/apt/lists/*
sudo apt-get clean
sudo rm -rf /var/lib/apt/lists/partial
sudo apt-get update -o Acquire::CompressionTypes::Order::=gz

Any help would be greatly appreciated. Let me know if you need any other information.

Thank you!

Try this. It has worked for my system behind a proxy:

sudo apt update

sudo apt upgrade --fix-missing --fix-broken

When there are many pending updates, I've found running this sequence twice has been necessary to get all the packages updated.

Hope this helps.

Note: My system is a Ubuntu 20.04 LTS console-only, running on an industrial PC in a private and secured network segment. It has access just to a single machine in the corporate network that runs a proxy for this sole machine.

My solution was remove the archive.ubuntu directory created by cnf.sh script, then run it again. After that, run the "sudo cp -av archive.ubuntu.com /var/www/html/ubuntu/mirror/".

This solves my hash sum mismatch problem.