I have two Ubuntu Mate machines. One runs 15.04 and the other 16.04. I have updated both using apt-get. On the 15.04 machine Firefox 44.0 tells me that Shockwave Flash 11.2 r202 is vulnerable and should be updated. The 16.04 machine running Firefox 47.0 and the same version of Shockwave Flash does NOT give me this warning.
I really do not want to update the 15.04 out of sync with the Ubuntu repositories. Can anyone point me to a success path?
TIA,
Ken