iMac restarts after the first start since 10.11.6

Hello

Since updating to OS X 10.11.6 my mid 2010 27 "iMac (iMac11, 3) restarts after a few minutes of availability.

It happens right after a few seconds.

The screen goes black, and then it displays this message. After the reboot, everything works fine.

Please post a report of EtreCheck of your system if you can get it to boot. Then we can consider for obvious questions that may be causing your problem.

A cause can be if you have any antivirus, cleanup or third-party maintenance utilities installed. Do you have?

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