I’ve installed Ubuntu desktop 25.10 from a live-USB stick on a computer
that previously contained Windows 10. Ubuntu is now the only OS on the computer.
When I now start the computer, it says: No Bootable Device.
I’ve run boot-repair, Recommended repair, from a live-USB stick. It did not help.
BootInfo summary from boot-repair at Ubuntu Pastebin
Is this an Acer?
You show 3 (duplicates) of unknown device in UEFI boot.
Unknown device is often from Acer. And you need to go into Acer, probably set Secure Boot back on, set UEFI password(never forget or reset to blank later), and enable “trust” on the unknown entry as ubuntu.
You can delete the duplicate unknown entries.
to see to confirm number & delete.
sudo efibootmgr
sudo efibootmgr -b XXXX -B #where XXXX is number of entry you want to delete.
man efibootmgr
Acer Aspire S13 shows UEFI screen with trust setting
This is an Acer Aspire F5-522.
After I set an UEFI supervisor password and enabled Secure Boot, I could
“Select an UEFI file as trusted for executing”. After pressing Enter
3 times, I see a list with the entries
I don’t understand what I shall do to enable “trust” on the ubuntu entry.
If I select the ubuntu entry and press Enter, I see
If I select one of the .efi files, a dialog is shown:
Do you wish to add this file to allowable database?
Boot Description [ ].
Is this where I’m supposed to add trust between the square brackets
for one of the files? Which file?
I’ve tested changing:
Change TPM (TCM) State: [Enabled] → [Disabled]
No success.
With Secure Boot enabled, choose shimx64.efi
I do not have UEFI Secure Boot on, but shimx64.efi is still used. You can only use grubx64.efi if secure boot is off.
You can name it anything you want, default is ubuntu.
But I have multiple installs and change default to version, or noble currently.
Then I have a noble-a on my sda drive, questing, debian, & jammy. I overwrite older installs with a new one.
I assume the <.> are also the duplicate entries efibootmgr showed. Best to delete all but the one you set to trust.
Great! Now I can boot into Ubuntu. Thanks to both @oldfred and @tea-for-one.
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