Using Ubuntu 21.04, I'm trying to update the firmware on a Dell Latitude 5510. The command is
fwupdmgr update, and it looks good to begin with.
I receive this message:
Upgrade available for System Firmware from 1.5.1 to 1.7.0
Latitude 5510 must remain plugged into a power source for the duration of the update to avoid damage. Continue with update? [Y|n]:
This goes well while the update is downloading and decompressing, but stops in the authenticating stage with this message:
missing signed bootloader for secure boot: /usr/libexec/fwupd/efi/fwupdx64.efi.signed cannot be found
I have seen similar questions both here and elsewhere, but no solution. I obviously don't understand this signing business, but still hope that someone here can assist.
Simple question: how can I sign the bootloader using only Ubuntu?