High Sierra 10.13.4 will not install - "Some Updates Not Installed"
You may want to consider yourself lucky as there seems to be a lot of people reporting problems with this particular update of macOS.

If you just Google "Mac OS 10.13.4" you will get a number of articles showing problems with just the update, not to mention the things that it breaks.

Yeah it installed fine for me and probably a lot of people, but enough folks had enough issues with this update that I think your best bet is to not install this update and wait for 10.13.5 to be released.