Upgrade Debian from bullseye to bookworm and PVE7 to PVE8

Here is a short checklist to upgrade Debian to latest bookworm version;

Proxmox update goes with Debian Latest stable version. I am running BullEye and need to upgrade to BookWorm.

Run checklist (a small script that comes with Proxmox):

pve7to8

Fix errors and warnings reported by above script.

Next change repositories for Debian and Proxmos;

1. update the configured APT repositories
   apt update
   apt dist-upgrade
   pveversion

   This should report at least 7.4-15 or newer version.

2. CEPH
   nano /etc/apt/sources.list.d/ceph.list
   make sure there is just one entry.
	

3. Bulleye to BookWorm
   nano /etc/apt/sources.list
   or better, run this command to search and replace bullye to
   bookworm

   sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list
   Output
   ------
   # security updates
   #deb http://security.debian.org bookworm-security main contrib

   # My repo changes
   deb http://deb.debian.org/debian/ bookworm main contrib non-free
   deb http://deb.debian.org/debian/ bookworm-updates main non-free contrib
   # security updates
   deb http://security.debian.org/debian-security bookworm-security main contrib non-free

   # PVE pve-no-subscription repository provided by proxmox.com,
   # NOT recommended for production use
   deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription

4. APT Repositorys
   I don't have special repositories here. so don't worry about this.

Install this package if using EFI to boot box;

apt install grub-efi-amd64

To clear CEPH warnings, reset Ceph monitor on VM.

Remove any used packages with this command;

apt autoremove

Re-run scan;

pve7to8

Make sure to disable enterprise library if using evaluation version;

modify enterprise repo;

nano /etc/apt/sources.list.d/pve-enterprise.list

and add a # at the beginning. Save this file 

Restart your nodes one by one.

References

https://pve.proxmox.com/wiki/Upgrade_from_7_to_8

https://pve.proxmox.com/wiki/Ceph_Nautilus_to_Octopus

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