Similar symptoms on Acer Aspire E5-521 - no touchpad or USB mouse, no
wifi, only generic graphics driver. Reverting to 4.4.0-42-generic is
effective as a workaround.
Fix suggested by Matti Laakso (comment #17) restores all but wifi:
apt install linux-image-extra-4.4.0-43
Running "dkms status" shows that the Broadcom Wifi driver (bcmwl) failed
to build for 4.4.0-43-generic. To fix this as well:
apt install linux-headers-4.4.0-43-generic
Driver should build (for 4.4.0-43-generic) and function normally again
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Wifi and sound no longer detected in kernel 4.4.0-43
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