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Here's a screenshot of VLC Media Player on a DVD: Wierd looking screenshot

IF I try to play a CD by using Videos, it says that "DVD Source is required to play the file, but is not installed" If i follow the link from there to Software, it displays a big frowny face, presumably because it is not a happy camper. Yes that is literally what happens.

Pretty much everything else works on the screen - websites display normally, programs work fine.

Here is what I've done so far:

sudo apt install libdvdcss2 libdvdread4 libdvdnav4 ubuntu-restricted-extras

sudo dpkg-reconfigure libdvd-pkg

Remove and reinstall VLC Media Player.

What should I try next?

Ubuntu 18.04.3 LTS
VLC Media Player 3.0.7 Vetinari
I do not have Nvidia-settings installed

Here is the output of dmesg. I have no idea what any of this means but one of the posts I read about such problems indicated it was relevant:

dmesg | tail

[ 1360.631367] sr 2:0:0:0: [sr0] tag#15 CDB: Read(10) 28 00 00 3c 4b 2c 00 00 01 00
[ 1360.631369] print_req_error: I/O error, dev sr0, sector 15805616
[ 1360.631375] Buffer I/O error on dev sr0, logical block 3951404, async page read
[ 1360.731321] sr 2:0:0:0: [sr0] tag#17 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 1360.731326] sr 2:0:0:0: [sr0] tag#17 Sense Key : Illegal Request [current] 
[ 1360.731329] sr 2:0:0:0: [sr0] tag#17 Add. Sense: Read of scrambled sector without authentication
[ 1360.731332] sr 2:0:0:0: [sr0] tag#17 CDB: Read(10) 28 00 00 3c 4b 2d 00 00 01 00
[ 1360.731334] print_req_error: I/O error, dev sr0, sector 15805620
[ 1360.731339] Buffer I/O error on dev sr0, logical block 3951405, async page read
[ 1361.109201] UDF-fs: INFO Mounting volume 'MILK', timestamp 2008/12/15 21:06 (1000)
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I was able to find the answer in this Youtube video:

https://www.youtube.com/watch?v=wN9tGhmRvns

Which recommends disabling hardware accelerated decoding in VLC's settings panel.

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