I can't play a commercial dvd on my ubuntu 22.04 laptop

Question

I went to “ask ubuntu” and tried the suggestion to install ubuntu restricted extras, and then to install libdvd4. This did not help. Another suggestion was to reset the dvd region code. I typed into the terminal the command sudo regionset /dev/sr0 and was told “command not found”.I tried to use the ubuntu universe repository, but once again after it ran some commands on the terminal, I was told “release not signed, can’t be done securely”, so process was stopped.

Answer 1

Perhaps some additional packages are required. I too could not play commercial DVDs until the following

sudo apt install libdvd-pkg libdvdnav4 libdvdread8
sudo dpkg-reconfigure libdvd-pkg

Which version of libdvdread may depend upon which version of ubuntu is used.