While there should be a better error message from libdvdread and the players should be able to give intelligent error messages, the installer should include 'regionset', check to see if there is a region set on any DVD hardware on install and offer to set the region if it has not been set. I ran into this issue while helping my friend putting Ubuntu 8.04 on his laptop (which originally came with an old SuSE Enterprise). Since he isn't all that technical, he never would have figured this out on his own, and it wasn't very obvious to me either.
While there should be a better error message from libdvdread and the players should be able to give intelligent error messages, the installer should include 'regionset', check to see if there is a region set on any DVD hardware on install and offer to set the region if it has not been set. I ran into this issue while helping my friend putting Ubuntu 8.04 on his laptop (which originally came with an old SuSE Enterprise). Since he isn't all that technical, he never would have figured this out on his own, and it wasn't very obvious to me either.