In case it helps tracking down why the bug appears between -18 and -21,
I found this in -19:
linux (4.4.0-19.35) xenial; urgency=low
...
* linux: Enforce signed module loading when UEFI secure boot (LP: #1566221)
- [Config] CONFIG_EFI_SECURE_BOOT_SIG_ENFORCE=y
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https://bugs.launchpad.net/bugs/1572659
Title:
bcmwl driver does not work with kernel 4.4.0-21 when secure boot
enabled
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