Mine

usage: update-rc.d [-n] [-f] <basename> remove
       update-rc.d [-n] <basename> defaults [NN | sNN kNN]
       update-rc.d [-n] <basename> start|stop NN runlvl [runlvl] [...] .
                -n: not really
                -f: force
dpkg: error processing flashplugin-nonfree (--configure):
 subprocess post-installation script returned error exit status 1
dpkg: ../../src/packages.c:191: process_queue: Assertion `dependtry <= 4' failed.
Aborted