Comment 5 for bug 1928434

> I reinstalled Ubuntu 21.04 from scratch and updated all packages during installation.

If you were able to boot the install image, then this might not be a bug in shim, as the shim on the install image should not work either. Also we only download upgrades during install, but do not apply them, so you should end up with 15.4-0ubuntu1.

I'd like to see results for each of those versions of shim (

* hirsute 15.4-0ubuntu1
* hirsute-updates 15.4-0ubuntu2
* groovy-updates 15+1552672080.a4a1fbe-0ubuntu2

Note that you need to install shim-signed.