1. add
deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription
to your sources
2. apt-get update
3. apt-get install proxmox-headers-6.5 proxmox-kernel-6.5
On this stage "proxmox-boot-tool kernel list" will NOT show this kernel...
After upgrade PVE 8->9 confirming lockups with errors in dmesg like:
```
INFO: task nfsd:546 blocked for more than 122 seconds.
```
environment:
HW: x370/x3700x
nfsd -> enabled only 4.2 (for server-side copying)
nfs clients -> on same server...