I was wondering if someone could tell me how to install the adobe flashplayer for Chromium in Ubuntu 16.04.
Thanks
Be sure to enable the Canonical partners repository then run:
sudo apt update
sudo apt install adobe-flashplugin
I stopped using Chromium, but I was using Pepper Flash for a while back then. It's deprecated now, adobe-flashplugin should be enough
Source: https://wiki.ubuntu.com/Chromium/Getting-Flash
See also for detailled installation instructions: https://wiki.ubuntu.com/Chromium/Getting-Partner-Flash