Eike,

The message tells you that packages depends on libsystemd0, but that
requirement is provided by libelogind0. In any case, libelogind0 will
be a stand-in for libsystemd0. If apt chose to remove packages you use,
you can still install them back after.

The warning is of no consequence here because you're replacing a
library with its counterpart.

On Sat, 07 Nov 2020 16:22:24 -0300
Eike Lantzsch via Dng <dng@???> wrote:

> On Saturday, 7 November 2020 15:52:25 -03 Ludovic Bellière wrote:
> > Hi Eike,
> >
> > Install libelogind0 first, so it takes precedence over systemd, then
> > elogind.
> Thanks - but ->
> That is impossible because of a catch-22.It is not even possible to
> deinstall/purge libsystemd0it seems to be there to haunt me.
>
> Copy and paste off aptitude introduced some not-so-nice esc-sequences
> into the text. I hope that it will not mess-up the message too much.
>
> *libsystemd0 (remove, 241-7~deb10u4)* will be removed. The following
> packages depend on *libsystemd0 (remove, 241-7~deb10u4)* and will be
> broken by its removal:
> * * *libaccountsservice0 (held/unchanged, 0.6.45-2) *depends on*
> libsystemd0 (>= 209) (provided by libelogind0 241.4-2)
> * * *libapt-pkg5.0 (held/unchanged, 1.8.2.1) *depends on* libsystemd0
> (>= 221) (provided by libelogind0 241.4-2)
> * * *libpulse0 (held/unchanged, 12.2-4+deb10u1) *depends on*
> libsystemd0 (provided by libelogind0 241.4-2)
> * * *network-manager (held/unchanged, 1.14.6-2+deb10u1) *depends on*
> libsystemd0 (>= 221) (provided by libelogind0 241.4-2)
> * * *openssh-server (held/unchanged, 1:7.9p1-10+deb10u2) *depends on*
> libsystemd0 (provided by libelogind0 241.4-2)
> * * *pulseaudio (held/unchanged, 12.2-4+deb10u1) *depends on*
> libsystemd0 (provided by libelogind0 241.4-2)
> * * *rsyslog (held/unchanged, 8.1901.0-1+devuan3~beowulf1) *depends
> on* libsystemd0 (provided by libelogind0 241.4-2)
> * * *samba-libs (held/unchanged, 2:4.9.5+dfsg-5+deb10u1) *depends on*
> libsystemd0 (provided by libelogind0 241.4-2)
> * * *sane-utils (held/unchanged, 1.0.27-3.2) *depends on*
> libsystemd0 (provided by libelogind0 241.4-2)
> * * *sddm (held/unchanged, 0.18.0-1+deb10u1) *depends on* libsystemd0
> (provided by libelogind0 241.4-2)
> * * *vlc-plugin-base (held/unchanged, 3.0.11-0+deb10u1) *depends on*
> libsystemd0 (provided by libelogind0 241.4-2)
> * * *xserver-xorg-core (held/unchanged, 2:1.20.4-1+deb10u1) *depends
> on* libsystemd0 (provided by libelogind0 241.4-2)
>
> I have no idea how or why this situation came to be.
>