El Capitan update to 10.13.3 fails to complete
I allowed my Macbook Pro (Retina, 13-inch, Early 2015) to update to el Capitan 10.13.3. As usual, the update ended by asking me to reboot to complete the update. I did so, but was immediately asked to do the same again. This has continued. Rebooting seems to make no difference.
Everything seems to run as normal, but Software Updates insists that I still need to update to 10.13.3 but System information shows I am still running 10.13.2.
MacBook Pro with Retina display, macOS High Sierra (10.13.2)