Change LXC from unprivileged to privileged

Article taken from Bobcares : original post 
 
 From the Proxmox GUI 
 
 
 First, log in to the Proxmox Web UI and access the dashboard. 
 
 
 Next, we have to shut down the LXC Container. So, click the container on the left panel and click Shutdown from the top menu. 
 
 
 Then, take a backup. So, go to the Backup tab and click Backup now. Keep default settings or customize as needed. Once you click “Backup,” wait for the “TASK OK” message. 
 
 
 Now, restore as Privileged. So, click on the backup file in the list and click Restore. Then, select ‘Privileged’ under privilege options and click ‘Restore’ again. 
 
 
 Then, start the container and confirm that it is running in privileged mode.