Security Update 2018-001 won't install

Tried this at least five times sometimes downloading in App Store, once copying from a known good ~/Library/Updates subfolder containing update, once downloading standalone installer from Apple website.

Hardware is iMac (27-inch, Late 2009), 2.8 GHz Intel Core i7, 12 GB 1067 MHz DDR3, Samsung EVO 850 1TB,

ATI Radeon HD 4850 512 MB

I have tried NVRAM reset, SMC reset, re-installing MacOS - which took over two hours.

This is the first ever update I have been unable to install ever on this machine. It installed fine on MacBook Air (13-inch, Late 2010), though took way too long to do so!

iMac, macOS High Sierra (10.13.4), 27" Late2010 ATI RadeonHD4850 512MB

Posted on Apr 27, 2018 2:47 AM

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17 replies

May 15, 2018 2:24 AM in response to Paul-HK

This worked on my Mac Mini to solve the restarting/shut down going to black screen and mouse with occasional start up issues.

Again Apple Support were struggling to identify the issue but I have sent them the link to this topic as it fixed mine. They are grateful and are forwarding it to their internal support teams to look at in more detail to try and establish whats happening.

May 31, 2018 12:50 AM in response to WDSalem

reboot sudo is a wrong command (it should be sudo reboot) which is a little weird.

Looks like it is struggling to connect to the update server, are you connecting to the Apple one or a local one?

The quickest way I found to resolve this was to rebuild my Mac (completely wipe and rebuild). Im lucky, all my files reside in iCloud or on attached storage so it was pretty easy for me to do. I understand a lot of people won't be set up that way.

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Security Update 2018-001 won't install