To reset unused PaloAlto firewall interface to its default state of not configured, choose the interface and press delete option at the bottom.
You might experience the following upload error in WordPress: Unexpected response from the server. The file may have been uploaded successfully.
When you experience problem with Ubuntu virtual machine stuck on Orange screen without desktop access, you can overcome it by increasing video memory of VM.
In Oracle Virtualbox, add virtual machine copies to list of orignal VM using this trick. However best approach is cloning VMs and not copy.