Proxmox Installer Rescue Boot: unknown algorithm 68

[Andreas_H]

Hello,

I made a fresh install of Proxmox using the current ISO (7.1-2). I used ZFS (RAID 1) with two disks.

Today I wanted to boot from the ISO into recovery mode, because we accidentally lost the root password. However, rescue boot fails - grub tells me:

error: compression algorithm 68 not supported
ERROR: could not find boot disk automatically

I managed to reset the root password in the meantime - my question is: why is the rescue boot not working?

Thanks,
Andreas

 

[chengkinhung]

Hi, I just encounter the same issue, I also want to reset the root password as failed to login after installation. I try to boot ISO and click the "Advanced options", and then choose the "Resuce boot", but it boot into normal but not shell, I still need to login. I want to chroot the filesystem and then change the root password.

 

[gomu]

Is it a legacy "BIOS" system, or UEFI ?
I have the same issue on legacy systems : I can boot install and debug installer on CD or USB, but the rescue entry always gives "error: compression algorithm inherit not supported"
I'm starting to think it's related to the old grub version used with legacy systems, since this boot entry works on an UEFI machine (which has no PVE installed on this, so I get another type of error, something like rpool not found, at least it loads the kernel modules and start looking for something...)