[lubuntu] Couldn't load plugin - Flash in Chromium

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http://ubuntuforums.org – I tried to find solution but I just couldn't. Does anyone of you know how to fix this problem? When I try to watch videos on YouTube, Chromium says "couldn't load plugin". There was flashplugin-installer already installed , but I reinstalled it, and Chromium(it did't help). I also tied to copy libflashplayer.so to /etc/lib/chromium-browser/plugins. Code: chromium-browser --enable-plugins does not help neither, and flash plugin is already enabled. Please help. Thank you. (Hardware)