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Restoring on Gnome-Disks a Disk Image (sda. Win + Linux) on an External Disk, which now doesn't boot

lc flag

As I explain in the title, I've found some errors after previously successfully restoring from a Disk Image on Gnome-Disks to sda again, where Windows 10 was installed and I've added KUbuntu 18.04 with OS: 64 bit (which I have customized much). Ok, so, now I've tried to Restore this Disk Image (sda) with other destination: External Drive, and apparently I've succeeded, but it is no longer possible to boot this External Drive. It would be perfect to be able to do it. I've already changed the USB port, I've even changed from UEFI (default) to its other boot option (even without Secure Boot enabled, etc), but it's not possible to boot. I hope there's a concrete, fast and safe solution for this problem. Thank you very much for the help. If you can help me, I'd try to help other users with the same problem later. Greetings.

VeggieUbuntu avatar
lc flag
If with your help I can finally boot my new external hard drive, it would be great to update my custom version of KUbuntu to the latest LTS version: Kubuntu 20.04.3 LTS. I think Ubuntu is a project as necessary as precious. Thank you very much!
oldfred avatar
cn flag
Do not know Windows, but my understanding is that it will not boot from USB drives. It is licensed to one system. External drives boot from a drive entry normally. That uses /EFI/Boot/bootx64.efi. If external was internal you have that file, but bootx64.efi may be Windows efi file or Kbuuntu's shimx64.efi. You want it to be copy of /EFI/ubuntu/shimx64.efi. And then boot drive entry just like you do to boot live installer to install Kubuntu. If UEFI install, keep UEFI on, secure boot off. Do not turn on or try to boot external in BIOS/CSM/Legacy mode as that just creates more issues.
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