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I just installed Ubuntu, and thus I'm unable to play movies. For example, if I run *.mkv file, I get the error of " Gstreamer backend error - Can't play the text file without video or visualization". If I run *.avi one, it says " Gstreamer backend error -Your Gstream installation is missing a plugin"

What should I install?

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up vote 5 down vote accepted

You need to install codecs.

Either you install vlc, this will intern download all codecs or install Ubuntu restricted extras from software center.

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