I’ve just recently noticed that pepperflashplugin-nonfree is a depreciated package and isn’t installing the latest version of pepper flash (Chromium now alerts you of this.) You can install the latest version from adobe:
- in “software and updates” go to “other software” and check “canonical partners” (if it isn’t already checked.)
- Close all browsers and thunderbird.
sudo apt update && sudo apt install adobe-flashplugin- This also installs the (buggy) npapi flash plugins so be sure to disable them (add-ons->plugins->(shockwave flash)->never activate) in firefox and thunderbird.