I had some massive problems when installing the 10.13.3 update on macOS. The update installed, my computer successfully restarted - but on a subsequent restart the boot failed and displayed the following installation log:
Apr 4 04:07:04 MacBook-Pro opendirectoryd[186]: [session] Processing a network change notification
Apr 4 04:07:06 MacBook-Pro Unknown[526]: Launching the Language Chooser for an OS Install
Apr 4 04:07:06 MacBook-Pro bspowerassertiontool[521]: Tool exited successfully (0).
Apr 4 04:07:06 MacBook-Pro launchprogresswindow[524]: ISAP: Show progress UI called
Apr 4 04:07:07 MacBook-Pro Installer Progress[180]: Progress UI App Starting
Apr 4 04:07:32 MacBook-Pro opendirectoryd[186]: [session] Received a network change notification
Apr 4 04:07:32 MacBook-Pro opendirectoryd[186]: [session] Received a network change notification