Comment 3 for bug 394755

The following code in postinst script is buggy and doesn't do what is expected:

=====
add_group_if_missing() {
    if [ -x /usr/sbin/addgroup ]; then
        if ! id -g motion >/dev/null 2>&1; then
                addgroup --force-badname motion || true
        fi
    fi
}
=====

'id -g' returns the effective group id whatever it is. The goal of this function should be to test is the group "motion" exists and create it if it is not the case.

If the group "motion" doesn't exists before the upgrade but the user "motion" does then this function doesn't create the group and the call to "chown motion:motion" fails