I have a Dell R340 running Proxmox VE 8. It is fully up-to-date but is running kernel 6.5.13. A couple of years ago there was an update to kernel 6.8 but it didn't boot up, so I reverted.

I'm now trying to see if I get it running on 6.8 or 6.14 in preparation for upgrading to Proxmox 9. I have updated the server BIOS, iDRAC and all firmware to the latest available versions, but still no luck.

When booting up with 6.8, it hangs soon after grub loads and shows "Timed out for waiting the udev queue being empty." It then says
"Gave up waiting for root file system device.. ALERT /dev/mapper/pve-root does not exist" before falling into BusyBox.

It's the same with 6.14.

I assume this may be an LVM issue, but I don't know what to look for. Without fixing this issue I'm not confident that I can upgrade to version 9 (even if I tried a fresh install).

Can anyone help?