Xubuntu 20.04 & snap: "127.0.0.1:443: connect: connection refused"

[peter_b]

[PROBLEM]

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sudo snap install btop

[sudo] password for user:
error: cannot install "btop": Post "https://api.snapcraft.io/v2/snaps/refresh": dial tcp
127.0.0.1:443: connect: connection refused

[SOLUTION]
I had the following lines in my "/etc/hosts":

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# Hack to disable automatic snap updates:
127.0.0.1	api.snapcraft.io

Well... To literally disable automatic updates. I really like my setups stable and well-known.
Anyways: Disable the localhost-loopback line, and the above command will work as expected again.
(Don't forget to re-enable the loopback afterwards, to disable auto-updates )