Fix Broken System

This can be caused by:

1. Installing contrib, non-free packages
2. Doing dist-upgrade

The procedure is:

1. Reboot from the USB disk
2. Advanced options ... --> Rescue mode
3. Choose the root file system
   • This is the partition that was mounted as /
   • Note, in the manual partition scheme, this is the 2nd partition of disk 1
4. Execute a shell there as the root
5. In the manual partition scheme, /var is mounted to the 2nd partition of disk 2
   • To see logs in /var/log/, mount /var
   • To install additional packages, mount /var

Nvidia Problem

Symptom: Boot hangs on normal startup.

1. Reboot the system using the USB disk. On the Debian boot screen, choose Advanced Options --> Recovery Mode. The last output on the screen is "fb: switching to nouveaufb from simple" indicating a problem with nouveau.
2. Reboot the system from the USB disk. Advanced options ... --> Rescue mode.
3. After the quick setup in the rescue mode, choose the root file system /dev/sda2 (the partition that is mounted as /). Execute a shell there as the root.
4. Move /etc/modprobe.conf to backup, if present.
5. vi /etc/modprobe.d/nouveau.conf and add the following 2 lines:

   blacklist nouveau
   blacklist lbm-nouveau

6. Exit and reboot from the hard disk.

Nouveau

Symptom: Boot hangs Cause: NVIDIA RTX 2070 Super not supported by nouveau Solution: Install nvidia-driver

No keyboard nor mouse at login

Solution: Install xserver-xorg-input-all