Do I need to install "adobe-flashplugin" or is this done automatically by "flashplugin-installer"?
Actually, you might have asked this question before
doing what this guy told you to do.
Installing adobe-flashplugin would have been an alternative to using flashplugin-installer. So it is either adobe-flashplugin or flashplugin-installer, never both.flashplugin-installer:
Will download the latest Adobe flash plugin for Linux Mint from the Adobe website as a .tgz archive, unpack it and install it.adobe-flashplugin
Is the latest Adobe flash plugin for Linux Mint from the Adobe website, converted into a .deb archive, which the Linux Mint software installer (apt, apt-get, aptitude ...) can use directly and install it.Result:
In both cases the same result. You will have the latest Flash plugin for Linux available in Firefox. It should be available in Chromium, too. Yet, I think I read in this forum that current Chromium versions experience problems with this Flash plugin.Note:
Google Chrome brings along its own Flash player, not the Adobe one, but a Pepper based Flash player.About Youtube and the latest Linux Flash Player:
It seems that more an more Youtube videos cause a warning that a newer Flash player were required than 18.104.22.1688. The Windows version is 22.214.171.124 and Chrome brings along a v126.96.36.199, too.
So far in all cases where I came across such warnings, there was a way of confirming or ignoring the warnings, and the video was played nonetheless. - Yet, I do not watch Youtube regularly.Install Pepper Flash Player For Chromium In Ubuntu/Linux Mint Via PPA:
There is a way of installing the genuine Google Chrome Pepper Flash Player 188.8.131.52 without installing and using Google Chrome: Install Pepper Flash Player For Chromium In Ubuntu Via PPA