For reference:
$ snap install ––help
Your command included some characters that look like dashes but are not:
"snap install \u2013\u2013help"
in some situations you might find that when copying from an online source such
as a blog you need to replace “typographic” dashes and quotes with their ASCII
equivalent. Dashes in particular are homoglyphs on most terminals and in most
fixed-width fonts, so it can be hard to tell.
error: snap "––help" not found
$
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https://bugs.launchpad.net/bugs/1782110
Title:
unhelpful error message when snap is installed already
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