VLC and Totem will not play DVDs in 10.04
 

Have downloaded the Ubuntu Restricted Extras, but still cannot play DVDs.

Try this. :)

Thanks. That worked.

you can also get libdvdcss from videolan.org in source form. Sometimes useful if you have an odd dvd that needs something newer to function. Live concerts that get made into DVDs seem to suffer the need IME. Although not much of an issue these days since DVD is mostly a relic now. Debian seems to bundle that script with Kaffiene.