I manage to get through all of the installation screens during the Ubuntu 18.04.3 Server install, up until the drive and partition selection screen, where it says there is a problem. I have attached the installer logs (linked from paste.ubuntu.com) which I hope will describe the issue better, as I do not know how to properly interpret the logs. From what I can tell, there is a drive issue because of the Python error output whilst it is looking at the filesystem, but I can't get much further than that.

https://paste.ubuntu.com/p/shPKXTFFsb/ https://paste.ubuntu.com/p/qyJ5yHHRcF/ https://paste.ubuntu.com/p/9N3yHnX3QG/ https://paste.ubuntu.com/p/Vzxn3fSddQ/