Finally, I managed to find workaround. I had made a copy of /EFI/BOOT/grubx64.efi with the name mmx64.efi on the bootable medium. After this, the USB disc was able to boot again and I was able to continue with installation process. After successful instalation wverything was OK.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1798171 Title: System fails to boot with \EFI\BOOT\mmx64.efi - Not Found To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1798171/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
