Can't configure network on VM - Network autoconfiguration failed

[Zeus97]

I am trying to install Ubuntu on a newly created VM but I can't get the network to autoconfigure during installation. I have tried manual config and nothing I've tried works. I've spent hours on this and can't get it down. I'm doing this on a Hetzner dedi. I've read their guide on it, but can't figure it out.
In /etc/sysctl.conf I have commented out the two lines of "net.ipv4.ip_forward=1 " & "net.ipv6.conf.all.forwarding=1".

/etc/network/interfaces: (I've changed sensitive values)

auto lo
iface lo inet loopback
iface lo inet6 loopback

auto enp0s31f6
iface enp0s31f6 inet static
        address <SERVER_IP>
        netmask 255.255.255.192
        gateway <SERVER_IP_GATEWAY>
        post-up echo 1 > /proc/sys/net/ipv4/conf/eno1/proxy_arp

iface enp0s31f6 inet6 static
        address 2a01:7s9:13a:3306::2
        netmask 64
        gateway fe80::1
        up sysctl -p

auto vmbr1
iface vmbr1 inet static
        address <UNUSED_SUBNET_IP>
        netmask 255.255.255.248
        bridge-ports none
        bridge-stp off
        bridge-fd 0
        post-up echo 1 > /proc/sys/net/ipv4/ip_forward

 

[Alwin]

I can only recommend to go through their documentation again. As they use pointopoint options, missing in the posted network stanza.
https://community.hetzner.com/tutor...ure-proxmox_ve#step-2---network-configuration