If you are using flashplugin-nonfree in Ubuntu Dapper from backports like me, you might see some error according to post-installation script failed.

sugree@sugree-laptop:~$ sudo apt-get upgrade flashplugin-nonfree
Reading package lists... Done
Building dependency tree... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0B of archives.
After unpacking 0B of additional disk space will be used.
Do you want to continue [Y/n]?
Setting up flashplugin-nonfree (7.0.68~ubuntu1~dapper1) ...
Downloading...  done.
usage: update-rc.d [-n] [-f]  remove
       update-rc.d [-n]  defaults [NN | sNN kNN]
       update-rc.d [-n]  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)

I recommend all you to upgrade as soon as possible because there are multiple vulnerabilities in current versions.

It's not too bad. Ubuntu team is solving this problem by releasing 7.0.68~ubuntu2~dapper1. Anyway, there is no binary package by now. You may download the source and build it yourself or wait for a while.

If you can't wait, just build it.

$ apt-get source flashplugin-nonfree
$ cd flashplugin-nonfree-7.0.68~ubuntu2~dapper1
$ dpkg-buildpackage -uc -us -rfakeroot
$ cd ..
$ sudo dpkg -i flashplugin-nonfree_7.0.68~ubuntu2~dapper1_i386.deb

Tags: flashplugin-nonfree, ubuntu, dapper