I have a 1TB drive that used to have only Manjaro on it. I shrank this partition to 650GB, and then installed Ubuntu on the other 350GB. Ubuntu works fine, but trying to boot into Manjaro results in an error message that says "Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0).
However, I am able to boot Manjaro just fine using the fallback initramfs in the advanced options:
I was going to post a picture of the full error screen, but apparently you have to be a higher TL on this forum to do that…
How do I fix this? Can you help me understand how and what I broke so I can learn from this, and hopefully not make the same mistake in the future?
Because I’m sure I’ll be asked this, here are the outputs of various commands run from my Manjaro installation:
$ pacman -Q linux linux54 5.4.58-1 $ uname -a Linux x570-mycomp 5.4.58-1-MANJARO #1 SMP PREEMPT Tue Aug 11 15:46:30 UTC 2020 x86_64 GNU/Linux $ sudo update-grub Generating grub configuration file ... Found theme: /usr/share/grub/themes/manjaro/theme.txt Found linux image: /boot/vmlinuz-5.4-x86_64 Found initrd image: /boot/amd-ucode.img /boot/initramfs-5.4-x86_64.img Found initrd fallback image: /boot/initramfs-5.4-x86_64-fallback.img Found Ubuntu 20.04.1 LTS (20.04) on /dev/nvme0n1p5 Found Windows 10 on /dev/sda1 Found memtest86+ image: /boot/memtest86+/memtest.bin /usr/bin/grub-probe: warning: unknown device type nvme0n1. done