I add a USB-DVD Drive and have not solve it. Becaus my Drive will be add as /dev/sr0 Devices on another Linux system. My crimson pureos Kernel have likely no support for this. Because i can not load sr_mod with modprobe - no module available.
I checked if the user is in the cdrom group and yes this is ok.
the Demesg output after attaching the Device say: The Device is not authorized … so you have to add it with usbguard to your List of allowed devices.
sudo usbguard list-devices
And find your device id it looks like four alpha numerical chars and a : in the middle. For example if its 0429:d3a4 you run the comment:
sudo usbguard allow-device 0429:d3a4
And your device is authorized now. However this solve not the issue that i have still no interface from the kernel in /dev/ to access the device/media.
I am not sure to give the advice to compile and boot a kernel by yourself. Because if you never done this on a linux device, you may end up with some unboodable system or with the lag of other important drivers.
Another good news it that the Installation of libdvdcss works with the Librem5, as amosbutto suggested here:
My Phone has first the issue that id can not handle dbconf-2.0, but after downloading the libdvd-pkg file with wget and run the # dpkg -i libdvd-pkg_1.4.2-1-1_all.deb config i had to do some # apt --fix-broken install as suggested and a dep-reconfigure libdvd-pkg as in the libdvdcss thread mentioned. and clied yes on the shell installation box poped up - And now # apt info libdvdcss2 listed is as installed.
So far from me now i will update if i find a safe and easy way to add/build sr_mod support in my Librem5 Kernel.