On Ubuntu 14.04.5 I just upgraded firefox to version 50.0; now there is a message on some pages which reads:
libavcodec may be vulnerable or is not supported, and should be updated to play videos
So how can I update libavcodec?
sudo apt-get install libavcodec
gives the following output:
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libavcodec
So maybe I don't have
libavcodec installed in the first place? So why do I get this message…?