Ubuntu: I/O error, dev sr0, sector 12054896

The following message is logged when closing the DVD with a medium inside:

"I/O error, dev sr0, sector 12054896" 

To see the 20 latest log messages run this command in a terminal:

dmesg | tail -n 20

To solve it, you may need to install regioset to set the DVD region code to its expected value.