PREUN

/bin/sh

if [ $1 -eq 0 ] ; then 
        # Package removal, not upgrade 
        systemctl --no-reload disable dropbear.service > /dev/null 2>&1 || : 
        systemctl stop dropbear.service > /dev/null 2>&1 || : 
fi

POSTIN

/bin/sh

if [ $1 -eq 1 ] ; then 
        # Initial installation 
        systemctl preset dropbear.service >/dev/null 2>&1 || : 
fi

POSTUN

/bin/sh

systemctl daemon-reload >/dev/null 2>&1 || : 
if [ $1 -ge 1 ] ; then 
        # Package upgrade, not uninstall 
        systemctl try-restart dropbear.service >/dev/null 2>&1 || : 
fi

Triggers

dropbear < 0.55-2

/bin/sh

# Save the current service runlevel info
# User must manually run systemd-sysv-convert --apply dropbear
# to migrate them to systemd targets
systemd-sysv-convert --save dropbear >/dev/null 2>&1 ||:

# Run these because the SysV package being removed won't do them
chkconfig --del dropbear >/dev/null 2>&1 || :
systemctl try-restart dropbear.service >/dev/null 2>&1 || :