Grub: Boot frozen

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The boot process with grub may be frozen at different stages, for a variety of reasons. This page aims to list possible scenarios, and redirect the user to a proper fix, according to scenario.

Frozen at "GRUB" after nvidia driver upgrade

boot computer, but before any grub boot menu is displayed, the monitor is black with the only letters "GRUB" written on it.
This happened just after a broken nvidia driver upgrade.

The general steps to fix the problem were:
1- boot into the system using a rescue disk.
2- In a console, create a script with the following commands and run the script, or manually enter and run each command individually:
Adapt the mount points and device name to suit your environment:


mkdir /mnt/gentoo
mount /dev/nvme0n1p2 /mnt/gentoo
mount -v -t proc proc /mnt/gentoo/proc
mount -v --rbind /sys /mnt/gentoo/sys
mount -v --make-rslave /mnt/gentoo/sys
mount -v --rbind /dev /mnt/gentoo/dev
mount -v --make-rslave /dev /mnt/gentoo/dev
mount -v -o bind /tmp /mnt/gentoo/tmp
mount -v -o bind /dev/pts /mnt/gentoo/dev/pts

chroot /mnt/gentoo /bin/bash

3- depending on your system, perform the upgrade necessary, in order to rebuild the video drivers.
emerge --update --keep-going --deep --backtrack=3 --changed-use --tree --ask --verbose-conflicts @world
In the present case, the x11-drivers/nvidia-drivers indeed needed to be rebuilt. After rebuilding it, exit the chroot environment and then reboot the system.