@softwaremaniac, I agree, I had a total of 8 machines out of 40 with similiar issues, and found that on 3 this was the problem. Didn't mean to hijack the post, just thought this may help someone.
Three of my machines failed to install this update. I compared the Security Updates between the computers that installed this update and none had KB4019264 installed. I uninstalled this update, and the 2019-02 update installed. Hope this helps.