[SOLVED] Grub boot error "not a directory"

[Yakuraku]

Hello again,

after my first adventures with Proxmox, ZFS and Grub I can't start it again.

At boot I get the message:

error: not a directory
Entering rescure mode...
grub rescue>

I already boot with a live-cd to check if the pool is ok, and: It is ok!
If i type set I'll get the following output:

cmdpath=(hd0)
prefix=(hd0,gpt2)/ROOT/pve-1@/boot/grub
root=hd0,gpt2

which looks quite good!

If i list the directories

grub rescue> ls /
@/ ROOT/ data/
grub rescure> ls $prefix
i386-pc locale fonts/ grubenv grub.cfg

What makes me a bit thinking is the following output

grub rescue> linux
Unknown command 'linux'.
grub rescue> linux
error: not a directory

I'm sure, I didn't do something stupid like running an update or similar.
Any idea how to continue to boot?
boot=zfs does nothing!

Also tried to chroot in the installation and update/reinstall grub!

 

[fabian]

can you do "insmod normal" ?

 

[Yakuraku]

grub rescue> insmod normal
error: not a directory

 

[Yakuraku]

I tried to perform a "Rescue Boot" with PVE-4.3 cd and get the following output:

ZFS Rescue Boot ...
error: lz4 decompression failed.
error: you need to load the kernel first.
error: you need to load the kernel first.

Press any key to continue...

This message have I always gotten, when I tried to boot with the 4.4.19-1-pve kernel. (have been using the 4.4.6-1-pve kernel). Can I somehow select a different kernel to boot with Rescue Boot?

 

[fabian]

what does "ls $prefix/i386-pc/" show? (an error message or a long list of files? no need for the complete content)

 

[Yakuraku]

grub rescue> ls $prefix/i386-pc/
error: not a directory

However

grub rescue> ls $prefix/
i386-pc locale fonts/ grub.cfg grubenv

An ls on /ROOT/pve-1 just returns

@/

When I boot in rescue and chroot into the system I get

ls /boot/grub/i386-pc/
.... A lot of files ...

 

[Yakuraku]

Got the system up and running again.
Used this guide to create a USB-Grub/-Boot device: https://www.nerdoncoffee.com/operating-systems/re-install-grub-on-proxmox/
Rebooted (using the current kernel)
Reinstalled grub (backup of /boot, copy of image/kernel files, grub-install, grub-update)
Now the system boots without the usb-stick. (But still have to select the Kernel 4.4.6 to boot instead of 4.4.19 due to the strange "lz4 decompression failed"error.

 

[fabian]

Got the system up and running again.
Used this guide to create a USB-Grub/-Boot device: https://www.nerdoncoffee.com/operating-systems/re-install-grub-on-proxmox/
Rebooted (using the current kernel)
Reinstalled grub (backup of /boot, copy of image/kernel files, grub-install, grub-update)
Now the system boots without the usb-stick. (But still have to select the Kernel 4.4.6 to boot instead of 4.4.19 due to the strange "lz4 decompression failed"error.

could you try reinstalling the 4.4.19 kernel ("apt-get install --reinstall pve-kernel-4.4.19-1-pve") and regenerating the initramfs ("update-initramfs -u -k 4.4.19-1-pve"), if any warnings/error messages are printed please post them here.

 

[Yakuraku]

I tried a different approach.
- moved /boot to /boot_backup
- created a new dataset /boot in the root pool
- set compression=off in the pool
- copied the files from the backup to /boot
- run install-grub and update-grub

Success. No more error about lz4.