- Open 
/etc/apt/sources.list.d/pve-enterprise.listand comment out the following line 
# deb https://enterprise.proxmox.com/debian/pve buster pve-enterprise- 
Remove
No valid subscriptionBackup
proxmoxlib.js:cd /usr/share/javascript/proxmox-widget-toolkit/ cp proxmoxlib.js proxmoxlib.js.bakOpen
/usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.js, search forNo valid subscription, then changeif (data.status !== 'Active') {toif (false) {, so that it never gets to run.Restart the Proxmox service (also be sure to clear your browser cache):
systemctl restart pveproxy.service