when try to update the error message appear <html>Αδυναμία κλειδώματος:<br/><br/>E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem. </html>
This means there was an error in the underlying package management system provided by your distro. This isn't a thing that Discover can fix, unfortunately. You should do what the error message tells you to do. :)