Install Debian 11 via this ISO: https://cdimage.debian.org/cdi…-11.8.0-amd64-netinst.iso. Then install OMV 6 via the installation script. The ISO contains non-free firmware, including from Realtek. The Proxmox kernel already includes these drivers. Second possibility... as Soma said, install Debian 12 and OMV7 beta right away. That's where the non-free drivers come in.
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RE: After installation and update no internet connection possible
I assume that the network works (otherwise execute the command omv-firstaid in the terminal/SSH) and OMV fails at DNS resolution. Under OMV/Network/Interfaces, select the network interface, then click on Edit and enter a DNS server under Advanced Settings/DNS Server (Google (1.1.1.1) or any other). I have entered the local Ip4 address of my Fritzbox. This then forwards the DNS request via pihole. And as Somas said, don't use apt-get update and apt-get upgrade. Use the command "omv-upgrade" or…