I had an existing installation of Lubuntu 18.04 which I wanted to upgrade to 20.04. Lubuntu docs say this requires a fresh install. My previous 18.04 installation was using GPT and EFI. During installation of 20.04 from the live USB I unmounted the previous drive as suggested on this blog post and chose to erase disk so Lubuntu would partition things automatically.
However Lubuntu 20.04 seems to have decided to install as MBR rather than GPT and also no EFI.
sudo fdisk -l shows
Disklabel type: dos
/sys/firmware/efi doesn't exist
I'm willing to reinstall but how can I get Lubuntu to install with GPT and EFI? Do I have to manually partition things? Or is there a way to get it to do it automatically?