I have installed libdvdcss2, but I still get this error when trying to play DVDs:
libdvdread4 was installed by default (This is a new System76 Pangolin Performance). I ran the install-css.sh script, and it completed with no problems.
I can confirm that libdvdread4 and libdvdcss2 are installed:
mac9416@charlotte:~$ dpkg -l | grep dvdcss ii libdvdcss2 1.2.12-0.0medibuntu1 Simple foundation for reading DVDs - runtime libraries mac9416@charlotte:~$ dpkg -l | grep dvdread ii libdvdread4 4.2.0-1ubuntu3 library for reading DVDs