Unpacking pve-cluster (from .../pve-cluster_3.0-12_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/pve-cluster_3.0-12_amd64.deb (--unpack):
 unable to stat `./etc/pve' (which I was about to install): Transport endpoint is not connected
Processing triggers for man-db ...
Errors were encountered while processing:
 /var/cache/apt/archives/pve-cluster_3.0-12_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)