am running whonix inside virtual machine.
Last time I have added debian testing and unstable repositories, than installed firejail from testing, made apt-get update and also apt-get upgrade, and got black screen after reboot.
File /etc/ld.so.preload was empty, I removed it, errors left screen but black screen still here.
I don't know how to fix it.
If I am pressing Host+F1, then logging and do:
sudo apt-get update && sudo apt-get dist-upgrade
last kernel log in attachment