While performing a system update on my Kali which is installed as main OS, the update process froze. I waited for some time, but the system remained unresponsive, so I had to forcefully power off the PC by holding the power button.
Upon rebooting, the system got stuck on the Kali Linux logo screen. Attempting to boot into recovery mode resulted in a kernel panic with the following error message:
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00
CPU: 1 PID: 1 Comm: init Not tainted 6.6.9-amd64 0000001
I tried booting from a Kali Live USB to troubleshoot and recover the system. My first attempt were completely messed up, and didn't recognize APT nor EXT4 filesystems. At this step my partitions were:
sda:
sda1
sda2
sda5
I tried to fix it using superblock backup to remount the partitions, which resulted in another kernel panic, so i will not enumerate these steps.
I rebooted again on Kali Live and used the MEMTEST66 utilities to check the memory, which showed no errors at all.
I rebooted again into Live and choose normal boot, and saw my partitions changed to:
sdb:
sdb1
sdb2
sdb5
Here are the steps I took from there and I got to work.
list your partitions
lsblk
Create mount points
mkdir -p /mnt/kali
mkdir -p /mnt/kali/dev
mkdir -p /mnt/kali/proc
mkdir -p /mnt/kali/sys
mkdir -p /mnt/kali/run
Mount the root partition
mount /dev/sda1 /mnt/kali
Verify contents
ls /mnt/kali
Mount filesystems
mount --bind /dev /mnt/kali/dev
mount --bind /proc /mnt/kali/proc
mount --bind /sys /mnt/kali/sys
mount --bind /run /mnt/kali/run
Chroot into the partition
chroot /mnt/kali
Update
apt update
Reconfigure locales
dpkg-reconfigure locales
Install firmware packages
apt install firmware-misc-nonfree
Upgrade
apt upgrade
Fix broken dependencies
apt --fix-broken install
Rebuild initramfs
update-initramfs -u -k all
Exit chroot and unmount filesystems
exit
umount /mnt/kali/dev
umount /mnt/kali/proc
umount /mnt/kali/sys
umount /mnt/kali/run
umount /mnt/kali
Reboot on your main system
reboot | 
