Tested this issue once more by enabling secure boot in the BIOS, and booting into Ubuntu 19.04 through GRUB2, no success as previously.
"Boot failure : a proper digital signature was not found. One of the files on the selected boot device was rejected by the Secure Boot feature." I believe that only Windows operating systems and their bootloaders have the right signature as they booted previously with secure boot enabled - before installing Ubuntu. (Some 9-10 months ago) Does Ubuntu install these digital signatures required by Secure boot after its installation? I think Ubuntu probably did not install them, as it haven't found a way to do so, due to unrecognised/unusual "Secure Boot System". But I have no idea how all this Secure Boot works, these are just guesses. Or Maybe the digital signature of Ubuntu is corrupted due to unsuccessful entry insertion: (If that even happened) [key 1] [SHA-256] 0000000000000000000000000000000000000000000000000000000000000000 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1821630 Title: After enabling Secure Boot - unable to boot Ubuntu To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1821630/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
