Adobe Flash is banned from my systems, even Linux.
One simple way is to use Google Chrome, it has a version of Flash that is maintained by Google, no need to upgrade/update anything with any potential security breach.
OK, if you insist ...
go to the Software Manager, type 'Flash' (no quotes) in the search box, press enter. It's 3rd on my list ... highlight it and press enter, (no idea why I cannot use double click) ... if it's already installed, remove it ... err, ok don't remove it ... it should be the latest version that is recommender for Mint anyway.
NO NEED DO ANYTHING IF FLASH IS ALREADY INSTALLED
You could, if you are feeling daring, use a Terminal ...
Code:
sudo apt-get install pepperflashplugin-nonfree
press enter & enter your password
if that didn't work, then it's a warning to you ... ok, maybe not ... then try
Code:
sudu dpkg-reconfigure pepperflashplugin-nonfree
once you install this version of Flash, it will NOT auto update, so you will have to do it...
Code:
update-pepperflashplugin-nonfree -install
and Linux users wonder why they left Windows.
I think I got that right ... but like I said, I don't trust Flash on any system!
If Mint has any important updates, I'd expect to see it listed in the Update Manager
Me, I installed Google Chrome, not Chromium, and if I 'need' flash to view something, I have a secure version.
You can use Firefox for everything else.
having fun, wish you were there ...