Comment 1 for bug 1925064

I downgraded to the shim* packages from groovy, like this:
oot@nsn7:/var/cache/apt/archives# l
total 1,1M
drwxr-xr-x 3 root root 140K abr 19 17:16 .
drwxr-xr-x 3 root root 4,0K abr 19 17:15 ..
-rw-r----- 1 root root 0 out 15 2020 lock
drwx------ 2 _apt root 4,0K abr 19 17:16 partial
-rw-r--r-- 1 root root 566K ago 3 2020 shim_15+1552672080.a4a1fbe-0ubuntu2_amd64.deb
-rw-r--r-- 1 root root 338K out 21 06:18 shim-signed_1.45+15+1552672080.a4a1fbe-0ubuntu2_amd64.deb
root@nsn7:/var/cache/apt/archives# scp shim* ~/
root@nsn7:/var/cache/apt/archives# cd
root@nsn7:~# dpkg -i shim*
dpkg: warning: downgrading shim from 15.4-0ubuntu1 to 15+1552672080.a4a1fbe-0ubuntu2
(Reading database ... 228150 files and directories currently installed.)
Preparing to unpack shim_15+1552672080.a4a1fbe-0ubuntu2_amd64.deb ...
Unpacking shim (15+1552672080.a4a1fbe-0ubuntu2) over (15.4-0ubuntu1) ...
Replaced by files in installed package shim-signed (1.46+15.4-0ubuntu1) ...
dpkg: warning: downgrading shim-signed from 1.46+15.4-0ubuntu1 to 1.45+15+1552672080.a4a1fbe-0ubuntu2
Preparing to unpack shim-signed_1.45+15+1552672080.a4a1fbe-0ubuntu2_amd64.deb ...
Unpacking shim-signed (1.45+15+1552672080.a4a1fbe-0ubuntu2) over (1.46+15.4-0ubuntu1) ...
Setting up shim (15+1552672080.a4a1fbe-0ubuntu2) ...
Setting up shim-signed (1.45+15+1552672080.a4a1fbe-0ubuntu2) ...
Installing grub to /boot/efi.
Installing for x86_64-efi platform.
Installation finished. No error reported.

And then rebooted. It failed the same way, so it seems to indicate it's not a problem with the shim, as these packages I had installed just before doing the do-release-upgrade.