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[solved] Kernel panic, unable to find root partition, what to do? (piefed.blahaj.zone)

submitted 1 day ago* (last edited 1 day ago) by akunohana@piefed.blahaj.zone to c/linux@lemmy.ml

10 comments fedilink hide all child comments

Edit: managed to boot by reinstalling grub, reinstalling the kernel (latest) with Artix' own basestrap script and then updating grub from a live USB. System saved. ~~Now it won’t accept a new IP from my dhcp server but that’s tomorrow’s problem.~~ Thank you all for your quick respones! 🥰

Artix Linux
Thinkpad T480
Symptoms appeared after a system upgrade

Error log:

[    0.801115] VFS: Cannot open root device "UUID=ed827e9a-47e4-490c-8a9a-0f0145925e0b" or unknown-block(0,0): error -6  
[    0.801117] Please append a correct "root=" boot option; here are the available partitions:  
[    0.801119] List of all bdev filesystems:  
[    0.801119]  ext3  
[    0.801120]  ext2  
[    0.801121]  ext4  
[    0.801122]  fuseblk  
[    0.801122]  btrfs  
[    0.801123] 
[    0.801124] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Should I adjust something in fstab from a live USB or can I point to the root partition from GRUB's CLI?

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[–] gnufuu@lemmy.ca 2 points 1 day ago* (last edited 1 day ago) (1 children)

Booting a live USB and reinstalling GRUB as follows has saved my butt in the past. Obviously replace the /dev/sdXY paths with your own. Further adjustments might be needed depending on your system.

# mount root partition:
sudo mount /dev/sdXY2 /mnt
# mount boot partition (if there is any)
sudo mount /dev/sdXY3 /mnt/boot
# mount efi partition (if there is any)
sudo mount /dev/sdXY1 /mnt/boot/efi
# mount other partitions:
for dir in /dev /dev/pts /proc /sys /sys/firmware/efi/efivars /run; do sudo mount --bind $dir /mnt$dir; done  
# chroot into mounted system:
sudo chroot /mnt /bin/bash -i 
# reinstall grub:
grub-install 
# rebuild grub.cfg:
update-grub 
# rebuild initramfs and exit chroot (not sure if necessary):
update-initramfs -u
# sync and exit:
sync
exit
reboot

[–] DickFiasco@sh.itjust.works 1 points 1 day ago

This is also the basic starting point for fixing many boot problems; boot from live USB, mount system partitions, chroot into temporary environment. Most problems are fairly easy to fix if you can just get to a command line.