Hi Jose,
do you mean the part about setting your software sources download location to Main server?:
Hi,
here is a link of instruction i used to get blueray working on my Ubuntu Mate.
it worked great for me, with no problems, Good Luck 
3 Likes
This one notably includes the link to a more recent key database than the other how-to.
hi guys, I see no solution to Bluray, I’ll try again, thanks…
hello tdmeskimo, Wimpy guide, I’ve done twice and everything that our friend has advised me Wolfman, but the VLC player and smplayer not find the disc start to play the movie. I’ll buy another disk and try. some player settings can be. the CPU is set to 100% when looking VLC the beginning of the film. possibly what happens to me is unusual but does not work. thank you very much…