Your log shows:

Log started: 2016-06-23  16:14:41
[...]
Removing grub-pc (2.02~beta2-36ubuntu8) ...
[...]
Removing grub2-common (2.02~beta2-36ubuntu8) ...
Removing grub-pc-bin (2.02~beta2-36ubuntu8) ...
Removing grub-common (2.02~beta2-36ubuntu8) ...
Running in chroot, ignoring request.
Purging configuration files for grub-common (2.02~beta2-36ubuntu8) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for install-info (6.1.0.dfsg.1-8) ...
Log ended: 2016-06-23  16:15:14

There are no other packages being installed at this time which would
explain why grub was removed in favor of something else.  So this
appears to be self-inflicted.  You need to reinstall the grub-pc package
to correct this problem.

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https://bugs.launchpad.net/bugs/1595862

Title:
  update-grub - command not found

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