Preinstall scriplet of sogo-3.1.1 package contains bug where existence of group sogo is forced but usage of this group is not included in useradd command thus resulting in error because it tries to create group that already exists.

This:

if ! id sogo >& /dev/null; then
/usr/sbin/useradd -d /var/lib/sogo -c "SOGo daemon" -s /sbin/nologin -M -r sogo
fi

should be changed to this:

if ! id sogo >& /dev/null; then
/usr/sbin/useradd -d /var/lib/sogo -c "SOGo daemon" -s /sbin/nologin -M -r -g sogo sogo
fi