# cleanup - remove Proxmox Release Key key from /etc/apt/trusted.gpg
/usr/bin/apt-key --keyring /etc/apt/trusted.gpg del 9887F95A >/dev/null 2>&1 || /bin/true
+ # cleanup - remove old stretch-incompatible variant of installing release key
+ rm -f /etc/apt/trusted.gpg.d/proxmox-ve.gpg /etc/apt/trusted.gpg.d/proxmox-ve.gpg~
+
# setup kernel links for installation CD (rescue boot)
mkdir -p /boot/pve
ln -sf /boot/vmlinuz-@KVNAME@ /boot/pve/vmlinuz