The issue here is that in both examples you are using the wrong package
name:
sudo apt install linux-generic-hwe.16.04
/usr/bin/apt-get --quiet --assume-yes \
--option=Dpkg::options::=--force-unsafe-io \
--option=Dpkg::Options::=--force-confold \
install linux-generic-hwe.16.04
The correct package name is linux-generic-hwe-16.04. By using a non-
existant package but using regular-expression characters (.) you are
triggering pattern match mode. Apt even tells you this in your manual
update:
Note, selecting 'linux-generic-hwe-16.04-edge' for regex
'linux-generic-hwe.16.04'
Note, selecting 'linux-generic-hwe-16.04' for regex 'linux-generic-hwe.16.04'
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https://bugs.launchpad.net/bugs/1666413
Title:
linux-image-hwe-16.04 depends on linux-generic-hwe-16.04-edge
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