I've attempted to install the macOS High Sierra 10.13.2 Update 4 times now, each time it restarts, goes thru the update process yet indicates it could not complete the update. I don't think the restart fully happened as it never went thru my sign in process upon reboot.
FlipPlayer-OTHER, Mac OS X (10.7.5)
Unfortunately, no luck. I first tried installing the Combo Update under the normal non-safe mode. It too produced the same "unable to install" result. I then tried to boot into Safe Mode but the system would not boot - after prompting me for my signon, the progress bar moved very slowly until the end of it's window and then sat there. I let it alone for an hour, then powered off, rebooted normally, tried the roboot to Safe Mode and got the same result. I ran Disk Utility, First Aid, which ran without errors, tried it again and got the same hang trying to go to Safe Mode. There was a Guest User account setup on my system (Apple set this up from a previous service call) but when I use it, all it gives me is Safari. When I exit Safari, it reboots back to my normal ID (although it doesn't prompt me to signon to my normal ID, which I thought was strange). I have a MacBook Pro 17" mid 2010, if that's any help diagnosing the issue.
I tried using the Combo, but the Restart still fails to complete and I am forced to power cycle the computer. Manual restart and power off also fail to complete.
I already was on the latest version. It's when I attempted to install the latest update that all the problems arose.
Update will not install due to some unknown condition
