In the past physically ejecting /dev/sr0 has worked for me. A recent apport-collect (while this report was already made) against "linux (Ubuntu)" was done here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1463627
In the past physically ejecting /dev/sr0 has worked for me. A recent apport-collect (while this report was already made) against "linux (Ubuntu)" was done here: https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1463627