Dear Maintainer,

During last upgrade of a Sid system:

Paramétrage de sddm (0.19.0-3) ...
Installation de la nouvelle version du fichier de configuration /etc/sddm/Xsession ...
Installation de la nouvelle version du fichier de configuration /etc/sddm/wayland-session ...
Failed to preset unit: File /etc/systemd/system/display-manager.service already exists and is a symlink to /lib/systemd/system/lightdm.service.
/usr/bin/deb-systemd-helper: error: systemctl preset failed on sddm.service: No such file or directory

Sorry for the messages in French, this is the default locale for this
system.

Thanks,
Patrice