It is not clear from the original report, but this may be result of this bug:
https://github.com/fwupd/fwupd/issues/8657
To check if this is indeed the problem, run this command:
$ efibootmgr|grep Linux-Firmware-Updater
Correct result looks like this:
Boot0002* Linux-Firmware-Updater
HD(1,GPT,6ccce482-e2c2-48ca-991e-608bee5d38af,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
File(.\fwupdx64.efi)
If you do not see the trailing part "File(.\fwupdx64.efi)", that is it.
The bug is fixed in upstream version 2.0.8 It needs to be backported to plucky.
Or, it is possible to fetch fwupd_2.0.8-3_amd64.deb and
libfwupd3_2.0.8-3_amd64.deb from questing repo and install by hand.
If it is confirmed, this bug should get a tag "plucky-regression", and
backport requested.
** Bug watch added: github.com/fwupd/fwupd/issues #8657
https://github.com/fwupd/fwupd/issues/8657
** Also affects: fwupd via
https://github.com/fwupd/fwupd/issues/8657
Importance: Unknown
Status: Unknown
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https://bugs.launchpad.net/bugs/2102703
Title:
UEFI dbx update does not apply
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