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After Switching To An NVMe Drive, My Ubuntu Machine Just Stops Dead. Where Do I Begin??

Solvedinitramfskernel-paniclinux15 replies · 193 views · started
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Accepted solution by Rowan Bauer — been there man your data is almost certainly fine, before any repair, boot the live USB and copy the important folders to an external…
  1. Tariq Ueda
    @tueda-3t7

    Weird one. After switching to an NVMe drive, my Ubuntu install panics on boot:

    2.481214 VFS: Cannot open root device "sda2" or unknown-block(0,0): error -6

    [    2.481214] VFS: Cannot open root device "sda2" or unknown-block(0,0): error -6
[    2.481362] Please append a correct "root=" boot option; here are the available partitions:
[    2.481513] 0b00         1048575 sr0
[    2.481601]  driver: sr
[    2.481702] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    2.481843] CPU: 3 PID: 1 Comm: swapper/0 Not tainted
[    2.481957] Call Trace:
[    2.482010]  <TASK>
[    2.482078]  dump_stack_lvl+0x48/0x70
[    2.482155]  panic+0x118/0x300
[    2.482231]  mount_block_root+0x1d3/0x1e0
[    2.482309]  prepare_namespace+0x136/0x165
[    2.482398] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs ]---

    But if i pick teh previous kernel under advanced options in GRUB, it boots fine and everything works xD So the disk isnt dead. Whats different about teh new kernel entry? Id like to fix the new kernel properly instead of picking the old one manually every morning ;) Im guessing something didnt get generated during the update, but i dont know what to check. im about to throw this thing out the window lol

    5
  2. Noor
    @noor_thread

    on Debian, Ubuntu, Mint and Pop!_OS, regenerate it and refresh GRUB:

    sudo update-initramfs -c -k all
sudo update-grub

    on Fedora use sudo dracut --regenerate-all --force xD On Arch use sudo mkinitcpio -P. worked for me anyway 🤷

    34 1 helpful
  3. Felix Lund
    @felixl432

    been there man unknown-block(0,0) usually means the kernel has no initramfs, or the initramfs lacks the driver for your root disk. boot the older kernel and check:

    ls -l /boot

    if theres a vmlinuz for the new version without a matching initrd.img / initramfs file, thats it. hope that helps :)

    37 0 helpful
  4. Felix Lund
    @felixl432

    honestly just reset the firmware and save yourself teh pain good luck man!

    0 4 helpful
  6. Maya Reid
    @mayar645

    if teh older kernel wont boot either, use ur live USB and chroot:

    sudo mount /dev/nvme0n1p2 /mnt
sudo mount /dev/nvme0n1p1 /mnt/boot/efi
for d in dev proc sys run; do sudo mount --bind /$d /mnt/$d; done
sudo chroot /mnt

    Adjust the device names to match lsblk, then regenerate teh iintramfs inside the chroot.

    lol

    2 0 helpful
  7. Kai
    @packet_pusher144

    idk man that sounds like bad advice tbh

    6 0 helpful
  9. Felix Lund
    @felixl432

    Check that /boot wasnt full duirng teh update. A full boot partition causes exactly this: the kernel copies, the initramfs doesnt. df -h /boot and remove old kernels with your package manager, not by deleting files.

    2 0 helpful
  10. Rowan Bauer
    @copper_deck-2a5
    Accepted solution

    been there man your data is almost certainly fine, before any repair, boot the live USB and copy the important folders to an external drive. it costs ten minutes and removes all the stress.

    2 6 helpful
  13. Rowan Bauer
    @copper_deck-2a5

    nah tbh some will say reinstall, and honestly if you have a separate /home partition a reinstall is quick. But this specific panic is almost always fixable in a few commands. but hey ymmv

    4 0 helpful
  15. Rowan Bauer
    @copper_deck-2a5

    hmmm have u checked your linux settings? mine were reset after an update good luck man!

    3 0 helpful
  16. Tariq Ueda
    @tueda-3t7
    in reply to @copper_deck-2a5

    @copper_deck-2a5 dude removed two old kernels, regenerated the initramfs, ran update-grub and teh new kernel boots perfectly. Backed up my photos first, just in case. Thank u! seriously made my day 😭🙏

    thumbsup

    6 2 helpful

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