could you post the output of lsblk. Do you have data on them? I assume you have multiple drives and you would like to add them as one big, the easiest way to achieve that is probably by using LVM.
pvcreate /dev/sda /dev/sdb /dev/sdc ...
vgcreate <volume_group_name> /dev/sda /dev/sdb...
you have set the DNS to 203.0.113.17, unless you actually have a DNS server running there you should set it to something like 18.104.22.168. Could you try it again with 22.214.171.124 as a nameserver, if it still doesn't work the problem is the forwarding itself.
What live CD did you use? It is important that everything in the pve-pool is inactive, so make sure you check that before you run any of the commands. vgchange -a n pve should set all lv's to inactive, you can verify that with lvscan.
Admin Guide chapter 2.4 describes how to install PVE on a Debian System. You just have to replace your Ubuntu 18.04 installation with a Debian Buster installation, then you can follow the short guide mentioned before.
lvresize --poolmetadatasize +1G pve/data will increase the space for metadata, since it is possible that it's full.
Could you try to run vgcfgrestore pve --test(and if it works, without --test) from a live OS with chroot into your installation.
vgcfgrestore pve --test
if this works you can remove the --test, it will restore metadata for the pve volumegroup from the most recent backup (Wed Sep 2 22:47:27 2020).
Than you can try lvm lvchange -ay /dev/pve/vm-<id>... for the VMs and data.
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