4.15.0-12.13-generic, from bionic-proposed, fixes this bug for me due to
it containing this upstream commit:

1751342095f0d2b36fa8114d8e12c5688c455ac4

Relevant CPU model info from /proc/cpuinfo:

cpu family      : 6
model           : 78
model name      : Intel(R) Core(TM) m5-6Y54 CPU @ 1.10GHz
stepping        : 3
microcode       : 0xc2

Model 78 corresponds to 0x4E in hex, which matches this in-kernel model:

#define INTEL_FAM6_SKYLAKE_MOBILE       0x4E

That's one of the models that was removed in the commit mentioned above.

I can also confirm that the flags field of cpuinfo contains "ibpb ibrs
stibp".

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https://bugs.launchpad.net/bugs/1755624

Title:
  With intel-microcode 3.20180312, kernel reports as broken spectre v2
  microcode

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