El Capitan 10.11.4 updated: loop with "unexpected launchd sigkill.

MacBook Pro 5.2 mid 2009 with 8 GB memory updated to the version of El Capitan 10.11.4 from the app store.

Starting after the initial installation stage goes into a loop of reboot with the message above appears black behind the initial grey screen.

Reinstalled the previous operating system and tried the 10.11.4 install again - same result.

I noticed several instances of this problem on various hardware systems reported on other web sites.  What would be the right way to collect useful diagnostic information?

Thanks for any help.

Two iMacs does not start after the 10.11.4 update

Tags: Mac OS & System Software

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