I upgraded my Thinkpad laptop from Ubuntu 20.04 to 20.10. All went well. However, there's now firmware updates available but when I try to apply them I get an error saying:
Unable to update "System Firmware": missing signed bootloader for secure boot: /usr/libexec/fwupd/efi/-fwupdx64.efi.signed can not be found
How do I fix this so I can update firmware? Shouldn't this be taken care of during the system upgrade?
Run the command apt install fwupd-signed and try install again.
I found the solution to this problem: For some reason a package called 'fwupd-signed' was not installed in 20.10 but must have been on 20.04 since I was able to upgrade firmware without problems. So the upgrade process from 20.04 to 20.10 left me without this package needed for firmware updates.
sbctl sign -s /usr/libexec/fwupd/efi/fwupdx64.efi -o /usr/libexec/fwupd/efi/fwupdx64.efi.signed but it doesn't seem to work, and that's all I can think of...