actually after further testing sending still works for the other wallets in armory but this particular one.
I have used it on the host system before upgrading to ubuntu 20.04 and it worked, now is the first time im trying to use it in the VM and it doesn't.

The only difference I see between the non-working one and the others is that it has 1 pending transaction (but I'm not using its coin, using coin control to select confirmed transaction) and the password is longer.