Comment 7 for bug 1906245

Summary:
of [1] "upgrading" we can not prevent "1.2-3->prerm upgrade 1.2-4" to fail.
But we can make the fallback of "1.2-4-prerm failed-upgrade 1.2-3" working (which it already is for qemu-block-extra).

We essentially need a rather empty "prerm" in hirsute that can be dropped in the next release as it is only covering that issue in the initial 1:5.1+dfsg-4ubuntu1.

... working on it

[1]: https://wiki.debian.org/MaintainerScripts