hi stokio invano,
thank you for your reply:
root@pve5-9:/etc/pve# mount |grep '/etc/pve'
/dev/fuse on /etc/pve type fuse (rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other)
root@pve5-9:/etc/pve# stat /etc/pve/nodes/pve5-9/pve-ssl.key
  Datei...