Youtube videos do not play. Instead, the following messages appear: "This plugin is vulnerable and should be updated", "Activate Adobe Flash", "Check for updates." Since my version is 14.04LTS, the Adobe Flash Player cannot be installed. What should I do for playing Youtube videos. The browser I use is Firefox.
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If you want to play the Youtube videos in Firefox now, just press the "Activate Adobe Flash" button.
Or use HTML5 for Youtube, there should be a "Request the HTML5 player" button on https://www.youtube.com/html5
I have the same problem with Firefox v.33 & 35 (latest for trusty & trusty-updates is v.35). I've read about it a few other places (don't have the links now), I think it's a bug; I couldn't find any fix or workaround for it, aside from just using Flash as a click-to-play plugin, which is fine with me.
Firefox is up to date, and the flash plugin is up to date:
- going to the Mozilla's "Plugin Check & Updates" (the "Check for updates..." link on any flash video) says Shockwave Flash is Up to Date
- clicking the Action button "Up to Date" goes to http://get.adobe.com/flashplayer/ which also says the latest version (last version for Linux actually) is 11.2.202.442
- the latest Ubuntu trusty package of flashplugin-installer (11.2.202.442ubuntu0.14.04.1) is the same 11.2.202.442
Chrome/Chromium does have it's own built-in flash player (a Pepper Plugin API?), and I saw an article on WebUpd8.org about a Firefox plugin available on the WebUpd8 PPA that should let you use the newer Pepper flash player in Firefox. See this other answer (or the WebUpd8 article) for more info.
