To do this:
- Boot the ISO ‘Live’.
- Open Konsole
- Type:
sudo kate /etc/calamares/modules/bootloader.conf
- Go to end of file and change the line:
installEFIFallback: true
toinstallEFIFallback: false
- Save the file, close Kate editor, close Konsole
- Attempt installation as you normally would
This works on my desktop I hope it works for users with this issue.
Please do let us know if this works or not.