As reported by lintian:
The maintainer script doesn't seem to set the -e flag which ensures
that the script's execution is aborted when any executed command
fails.
Refer to Debian Policy Manual section 10.4 (Scripts) for details.
# If openvswitch-switch is installed, and then later openvswitch-brcompat is
# installed, make sure that ovs-brcompatd starts.
if test X"$1" = Xconfigure && \
# If openvswitch-switch is installed, and then later openvswitch-brcompat is
# installed, make sure that ovs-brcompatd starts.
if test X"$1" = Xconfigure && \