If you are installing Tails into a VM for testing or anything else, always remember to mark the drive as a removable USB drive. Otherwise, the installation step will finish properly, but, you will get errors like the following screenshot while booting from the drive.

The option to do so is available in the details section for the vm in virt-manager.

I wasted a few hours today while trying to get a new VM for the SecureDrop admin setup tests.