[Bug 1845314] Re: udisks2 fails to install in a container with systemd 243

[Jose Manuel Santamaria Lema]

2. Why this is happening?

First of all, the udisks2 installation fails because the postinst script
fails. Inspecting the postinst script of udisks2, we can see these
lines:

if [ "$1" = "configure" ]; then
    # we ship udev rules, so trigger an update
    udevadm trigger --subsystem-match=block --action=change
fi

That udevadm command fails, i.e. ends with non-zero status with systemd
>= 243. This new different behaviour of udevadm makes the postinst
script fail, and that makes the package installation fail.

While I didn't git bisect the thing, reading the systemd git history makes me believe that the specific commit which produced this new behaviour could be this one:
https://github.com/systemd/systemd/commit/0584b17a8c7d17649aef9f06a8aee304dc80eb7e

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https://bugs.launchpad.net/bugs/1845314

Title:
  udisks2 fails to install in a container with systemd 243

Status in systemd package in Ubuntu:
  New

Bug description:
  santa_ | rbalint: hey while systemd 243 was available in eoan I still
  got one of "my" issues (udisks2 fails to install in a container)

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