From log:
Paramétrage de sasl2-bin (2.1.27+dfsg-1) ... invoke-rc.d: syntax error: unknown option "--skip-systemd-native" dpkg: erreur de traitement du paquet sasl2-bin (--configure) : installed sasl2-bin package post-installation script subprocess returned error exit status 1
Additionally it looks like /etc/default/saslauthd has a local modification.
From log:
Paramétrage de sasl2-bin (2.1.27+dfsg-1) ... systemd- native"
invoke-rc.d: syntax error: unknown option "--skip-
dpkg: erreur de traitement du paquet sasl2-bin (--configure) :
installed sasl2-bin package post-installation script subprocess returned error exit status 1
Additionally it looks like /etc/default/ saslauthd has a local modification.