I have a problem with Software Update, I get a message about updating Virtualization, but every time I try to update it just runs the same lines over and over.
I made a little gif fiel so you can see what I mean
Is your source for updates your country's locale server? If so, switch it to Main Server and see if it works.
Start Software Updater, then select Stop, then choose Settings button. Then go to first tab, if set to your locale, use drop down arrow to change to Main Server.