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Can't boot after new install of Ubuntu 20.04.3 - boot-repair does not work either

in flag

I am trying Ubuntu for the first time, and erased everything else on the machine. The installation was successful, but after restarting I only got a grub line. I then used a boot-repair stick, which did not work. The message I got was:

The current session is in BIOS-compatibility mode. Please disable BIOS-compatibility/CSM/Legacy mode in your UEFI firmware, and use this software from a live-CD (or live-USB) that is compatible with UEFI booting mode. For example, use a live-USB of Boot-Repair-Disk-64bit (www.sourceforge.net/p/boot-repair-cd), after making sure your BIOS is set up to boot USB in EFI mode. This will enable this feature.

I thought I already used exactly the Boot-Repair-Disk for 64bit that they mentioned? I also turned off Legacy and enabled Secure Boot, but then I cannot see the usb-stick in the boot menu.

http://paste.ubuntu.com/p/dSR4Px6S7z/

I obviously have some fundamental fault in my understanding of how these things work together. Would be happy about any help/information.

oldfred avatar
cn flag
If UEFI hardware you should always boot in UEFI mode, not old legacy/BIOS/CSM mode. And to repair an UEFI install, you need to boot in UEFI mode. But you now have installed grub in both UEFI boot mode and BIOS boot mode. Since fstab has UEFI entry, your install is UEFI, but may not be UEFI with Secure Boot depending on whether it was on when you installed. Many systems with Secure Boot also have settings on USB ports or USB boot as that is also not secure. But then you cannot repair system? Turn Secure Boot off & boot in UEFI mode, it may just work.
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