... continuing: This is when using the boot option in the temporary boot menu (F12)
"Linpus Lite (<name of the USB drive>)" in the picture attached to the previous comment. This is the only available USB boot option in UEFI mode. Then I turned off UEFI mode and set teh computer to boot in 'legacy mode'. Now there were more boot options in the temporary boot menu (F12). These options are shown in the picture attached to the previous comment. The option "USB Hdd: <name of the USB drive>" *works* also with USB drives cloned from the current Ubuntu Groovy as well as Lubuntu Groovy. So the problem in this case is not due to secure boot, but the "Linpus Lite" boot option does not work with the current Groovy iso files. It works with older iso files including Ubuntu 20.04.1 LTS and Groovy iso files from before you modified the boot system (when you removed syslinux boot in BIOS mode, but obviously also modified the boot system in UEFI mode). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1892754 Title: Unable to boot in UEFI+secure boot mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cd-boot-images-amd64/+bug/1892754/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
