Comment # 4 on bug 1129466 from Frank Kr���ger

Given TW20211102 with secure boot enabled, 'sudo fwupdmgr install <filename>'
results in an error message: "missing signed bootloader for secure boot:
/usr/libexec/fwupd/efi/fwupdx64.efi.signed cannot be found".

First of all, I had to install fwupd-efi-1.1-1.1.x86_64 manually. Second, this
package only provides fwupdx64.efi rather than fwupdx64.efi.signed in
/usr/libexec/fwupd/efi/. As a workaround a symbolic link solves the issue.