apt install linux-image-4.4.0-22-generic=4.4.0-22.39 linux-image-
extra-4.4.0-22-generic=4.4.0-22.39

should downgrade those and make apt happy, then you can install
-23.40~bpo1 from the url without worries, and that'll upgrade to proper
-23.40 once it's available, or you can purge them after testing

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https://bugs.launchpad.net/bugs/1559308

Title:
  Plugging HDMI screen in causes system hang

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