I'm aware this has been asked a hundred times but it seems like none of the solutions that have been posted for other people are working for me.

Adobe must've changed something in the past year because half of the questions are completely outdated.

Here's what I've done:

sudo apt update

sudo apt install adobe-flashplugin browser-plugin-freshplayer-pepperflash

According to most tutorials online this should work. But it doesn't.

I tried installing

flashplugin-installer

but not only does it not work it also gives me an "update" message every time I start, but when I choose to update nothing happens.

I checked here https://helpx.adobe.com/flash-player.html and firefox is not recognizing flash player to be installed.

I'm completely lost and I feel like I installed and uninstalled so much stuff that at this point it's going to be impossible to actually fix this.

I don't know what to do anymore, please help.

EDIT: Flash works perfectly on Chromium. I don't know if Chromium still comes with its internal version of Flash, but it seems to be working just fine.