Bug#850011: systemd package removal issue

[Vitaliyi]

Package: systemd
Version: 215-17+deb8u

I've tried to remove systemd package, as all normal users of Linux.
But it won't clean after itself properly:

# apt-get remove --purge --auto-remove systemd
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  systemd*
0 upgraded, 0 newly installed, 1 to remove and 5 not upgraded.
After this operation, 12.2 MB disk space will be freed.
Do you want to continue? [Y/n]
(Reading database ... 60858 files and directories currently installed.)
Removing systemd (215-17+deb8u5) ...
systemd is the active init system, please switch to another before removing
systemd.
dpkg: error processing package systemd (--purge):
 subprocess installed pre-removal script returned error exit status 1
Failed to stop lib-init-rw.mount: Unit lib-init-rw.mount not loaded.
addgroup: The group `systemd-journal' already exists as a system group.
Exiting.
Errors were encountered while processing:
 systemd
E: Sub-process /usr/bin/dpkg returned an error code (1)


For some reason this poor thing tries to add group systemd-journal when
being removed.
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