I hope yes. I've checked and checked. Officialy on Dell SIte the R350 is supported by Canonical Ubuntu Server LTS 20.04 and 22.04 i immagine.
also the support answered me:
We don't keep a hardware compatibility list. But PVE 7.2 uses a 5.15 kernel that's based on the one in Ubuntu 22.04...
also enabling in /etc/default/pveproxy LISTEN_IP=0.0.0.0 or disabling IPV6 doesn't has any effect after restarting "systemctl restart pveproxy.service spiceproxy.service" .
Disabling any MTU settings from vmbr0 it works correctly.
Is it possible to use a LInux bridged and bonded iface witch MTU size 9000 ?
When i try to set it up and enable mtu on vmbr0 I loose the web Gui on IP4
# my /etc/network/internaces
iface lo inet loopback
iface eno8303 inet manual