flashplugin-nonfree install produces errors

[Timothy Miller]

When I install flashplugin-nonfree (see bug #61932), I get (from the error messages that appear when you "show details") the following error message (the messages are actually copied from manually using apt-get, because adept does not let me copy from its "terminal").

# sudo apt-get install flashplugin-nonfree
Reading package lists... Done
Building dependency tree... Done
flashplugin-nonfree is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 19 not upgraded.
1 not fully installed or removed.
Need to get 0B of archives.
After unpacking 0B of additional disk space will be used.
Setting up flashplugin-nonfree (7.0.68~ubuntu1~dapper1) ...
Downloading... done.
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
Errors were encountered while processing:
 flashplugin-nonfree
E: Sub-process /usr/bin/dpkg returned an error code (1)