Further tests on the currecnt Ubuntu daily 20201007.1
ACER Aspire E3 boots BIOS,UEFI;UEFI +secure boot without errors Dell Inspirion 3521 - BIOS - success - UEFI and UEFI+secure boot - fail Lenovo X230i - boots successfully in all boot modes
Boot media created with "Startup Disk Creator" in Lubuntu Focal
Further tests on the currecnt Ubuntu daily 20201007.1
ACER Aspire E3 boots BIOS,UEFI;UEFI +secure boot without errors
Dell Inspirion 3521 - BIOS - success - UEFI and UEFI+secure boot - fail
Lenovo X230i - boots successfully in all boot modes
Boot media created with "Startup Disk Creator" in Lubuntu Focal