After an system update this message appears
After click in "run this action now" button
flash was not working
You could too have problem instaling it from the official adobe website
for instance in my case for Ubuntu I selected APT version downloads and after have installed it, flash did not work, I had to uninstall it via Synaptic.
Flash installed but
Flash is not working
for facility , you can install Synaptic from the software center, and search
and uninstall it, there you will realize that it automatic will uninstall one or more packages too, continue or accept.
After that , search from Synaptic
And install it.
I had a problem with adobe-flashplugin. I was installing it because found this information. I have to say that above is a option for you all that have similars problems and that adobe-flashplugin is the oficial way to install it.