Jeremey, actually, I'm not sure, but I think the Ubuntu update was
compiling the module after downloading the new kernel before the system
was rebooted into the new kernel, which is how the module was compiled
for the old kernel instead of the new. On rebooting, I was unable to
rebuild the module for the new kernel, as it said the module was already
installed. Using "modprobe -r <modname>" doesn't work because the module
is installed by dmks. I had to issue the command

sudo dkms remove -m 8812au -v 1.0 -k <kernel>

to remove it. Without the kernel specified, I think it will delete
module builds for all kernel versions, which means you won't be able to
boot into an older kernel and have the wifi work.

Then I was able to rebuild the module from the current (latest) kernel
version and install it with dkms, and everything worked fine:

    sudo dkms add -m 8812au -v 1.0
    sudo dkms build -m 8812au -v 1.0
    sudo dkms install -m 8812au -v 1.0

 As I said in my last post however, with the most recent update to
kernel 4.4.0-38, the build happened automatically and this wasn't
necessary. I'm optimistic the bug could be fixed.

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https://bugs.launchpad.net/bugs/1613837

Title:
  rtl8812au-dkms 4.3.8.12175.20140902+dfsg-0ubuntu2: rtl8812au kernel
  module failed to build [/lib/modules/3.13.0-77-generic/build: No such
  file or directory.  Stop.]

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