After a frustrating evening trying to setup a Ubuntu 20.04 VM and being unable to upgrade any packages I had to dig into the detail of what the issue was.
TL;DR The issue turned out to be a conflict with Windows Subsystem for Linux (WSL) that uses Hyper-V behind the scenes. The solution being to either remove Windows virtualisation platform or configure VM’s to user Hyper-V in Virtualbox.
The issue being that running apt update failed with hashsum mismatches. I initially thought it may be an apt configuration issue and tried various update servers…
