On bookworm, after adding repo and key :
sudo apt install proxmox-default-kernel
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
proxmox-kernel-6.8 : Depends: proxmox-kernel-6.8.12-7-pve-signed but it is not installable or
proxmox-kernel-6.8.12-7-pve but it is not installable
pve-firmware : Conflicts: firmware-atheros but 1:20230625-2+rpt3 is to be installed
Conflicts: firmware-brcm80211 but 1:20230625-2+rpt3 is to be installed
Conflicts: firmware-libertas but 1:20230625-2+rpt3 is to be installed
Conflicts: firmware-linux-free but 20200122-1 is to be installed
Conflicts: firmware-linux-free:armhf
Conflicts: firmware-misc-nonfree but 1:20230625-2+rpt3 is to be installed
Conflicts: firmware-misc-nonfree:armhf
Conflicts: firmware-ralink
Conflicts: firmware-realtek but 1:20230625-2+rpt3 is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
sudo apt install proxmox-default-kernel
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
proxmox-kernel-6.8 : Depends: proxmox-kernel-6.8.12-7-pve-signed but it is not installable or
proxmox-kernel-6.8.12-7-pve but it is not installable
pve-firmware : Conflicts: firmware-atheros but 1:20230625-2+rpt3 is to be installed
Conflicts: firmware-brcm80211 but 1:20230625-2+rpt3 is to be installed
Conflicts: firmware-libertas but 1:20230625-2+rpt3 is to be installed
Conflicts: firmware-linux-free but 20200122-1 is to be installed
Conflicts: firmware-linux-free:armhf
Conflicts: firmware-misc-nonfree but 1:20230625-2+rpt3 is to be installed
Conflicts: firmware-misc-nonfree:armhf
Conflicts: firmware-ralink
Conflicts: firmware-realtek but 1:20230625-2+rpt3 is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
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