nano /etc/apt/apt.conf.d/75pveconf
Change lines..!
Acquire::https::enterprise.proxmox.com::CaInfo "/etc/apt/pve-repo-ca-certificates.crt";
Acquire::https::enterprise.proxmox.com::Verify-Peer "false";
/etc/apt/sources.list.d/pve-enterprise.list
Need to change the line:
"deb https://enterprise.proxmox.com/debian jessie pve-enterprise"
to
"deb http://download.proxmox.com/debian jessie pve-no-subscription"
hOLOlu 