[How-to]Remove adobe-flashplugin

So one day, for some reason I don't remember, I tried to remove the package adobe-flashplugin.  However, there were some nasty errors which caused dpkg hell.  I gave up for the time being.  Then, a few days ago, I needed to do the same thing again because I wanted to use flashplugin-nonfree instead, and I don't see the point of having more than one installed at the same time.  However, it again gave me some errors with update-alternatives.  No matter what I tried to do, like force it or reinstall it, it failed epically.  Then, I figured it out.  Here are the steps.

1) Install an alternate flash plugin, like gnash or flashplugin-nonfree

2) This is the crucial step!  If you did not see lines like

update-alternatives blah...blah

when installing the package, you will need to do this.  Run

update-alternatives --install /usr/lib/[browser]/plugins/flashplugin-alternative.so [browser]-flashplugin /path/to/new/flash/plugin 10

replacing [browser] with iceape, iceweasel, mozilla, firefox, xulrunner, midbrowser, and xulrunner-addons.

3) You should now be able to uninstall adobe-flashplugin normally!