


I'd run apt-cache in a terminal, and search for adobe-flashplugin or flashplugin-installer (or just flashplugin). In this case, it looks like yours only launching the Software Center, and maybe doing a strange search that doesn't get any results. Note that the about Adobe Flash Player page says the "Linux - Mozilla, Firefox - NPAPI (Extended Support Release)" version is apparently not being updated past 11.2.x for Linux (& Solaris).

Mozilla, Firefox - NPAPI (Extended Support Release) Update package index files (run sudo apt-get update ). And just in case the adobe-flashplugin package is missing, you may not have the "Canonical Parter" repo activated in Software & Updates / Software Sources, see Ubuntu's help page for 14.04 trusty or 16.04 xenial. Make sure you have the Universe repository enabled (in Software Sources, accessible from Software Center -> Edit -> Software Sources, or sudo add-apt-repository universe or see How do I enable the "Universe" repository? ).ġa.
