May 15 20:54:23 nextcloud systemd[1]: Starting The Apache HTTP Server...
May 15 20:54:23 nextcloud systemd[201]: apache2.service: Failed to set up mount namespacing: Permission denied
May 15 20:54:23 nextcloud systemd[201]: apache2.service: Failed at step NAMESPACE spawning /usr/sbin/apachectl: Permission denied
May 15 20:54:23 nextcloud systemd[1]: apache2.service: Control process exited, code=exited, status=226/NAMESPACE
May 15 20:54:23 nextcloud systemd[1]: apache2.service: Failed with result 'exit-code'.
May 15 20:54:23 nextcloud systemd[1]: Failed to start The Apache HTTP Server.
Do this:
sed -i -e 's,PrivateTmp=true,PrivateTmp=false\nNoNewPrivileges=yes,g' /lib/systemd/system/apache2.service
systemctl daemon-reload
systemctl start apache2.service
systemctl statup apache2.service
OR
Enable nesting in the CT Options, under Features.
Register Hostname with DHCP Server
touch /etc/network/.pve-ignore.interfaces
Edit /etc/network/interfaces to include hostname <hostname> under the eth0 interface.