I feel I've tried everything, and am honestly out of ideas; for some reason I simply can't access the apt repositories, e.g. "deb http://download.proxmox.com/debian/pbs-client bookworm main". I'm able to ping the repos, e.g.:
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Code:
root@proxmox:~# ping6 download.proxmox.com
PING download.proxmox.com(sg.cdn.proxmox.com (2402:1f00:8001:f7a::65)) 56 data bytes
64 bytes from sg.cdn.proxmox.com (2402:1f00:8001:f7a::65): icmp_seq=1 ttl=52 time=86.2 ms
64 bytes from sg.cdn.proxmox.com...Read more