I have a similar message trying to install 20.04.1:
An error occured handling 'partions-sda5': RuntimeError - Verifying /dev/sda5 partition flag, expecting swap, found None
I have a similar message trying to install 20.04.1:
An error occured handling 'partions-sda5': RuntimeError - Verifying /dev/sda5 partition flag, expecting swap, found None