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I'm having problems playing DVDs in Ubuntu Jaunty (9.04); some DVDs work, but most don't. The error message in dmesg is:

end_request: I/O error, dev sr0

All DVD player programs simply freeze after this error.

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up vote 8 down vote accepted

It is css encrypted disks that causes this error. The solution is to install libdvdcss2, which can be install by first installing libdvdread4, and then running

/usr/share/doc/libdvdread4/install-css.sh

This will add the medibuntu-repos and install libdvdcss2 and solve the problem.

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Thanks! This fixed my problem. Unfortunately a little late; I already bought a brand new DVD drive and SATA cables only to discover I still couldn't play DVDs. Thank you very much to the media industry, making just a bit more profit thanks to ridiculous DRM! – mgiuca Feb 27 '11 at 1:26
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up vote 3 down vote

The Medibuntu repository has the packages for supporting encrypted DVD playback. Check out this page on the Ubuntu Wiki for installation details.

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