Had this problem for a few months on a server, VM system info page is not showing updates.
A fresh install would sort it but the client is reluctant, as they can be at times.
http://s16.postimg.org/em81f0cs5/updateproblem_bl.jpg
Any ideas how to fix this without a fresh install?
I can see them via webmin… system… etc but not showing on main VM info.