I resolved the problem for myself.

I searched for compiz related files in my wife's home directory and
found .config/compiz-1/compizconfig/config

In there, she had a config resembling the following:

[general_ubuntu]
profile = unity-lowgfx

I, on the other hand, had a config like this:

[general_ubuntu]
profile = unity

I changed her config to match mine and logged her back in and it was
fixed.

I note others complaining of similar errors found that switching *to*
low GFX fixed the errors for them prior to a patch hitting upstream.

I don't know how my wife got the lowgfx config while I didn't. Neither
of us have manually messed with these configs in the past. Both our
systems were working fine yesterday (23 March UTC+8).

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https://bugs.launchpad.net/bugs/1758009

Title:
  Unity not starting: compiz-config crashes on login

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