Currently running Elementary OS 5, which is based of of ubuntu 18.04, but the apt-get install is not supported https://github.com/cli/cli/issues/448#issuecomment-688767787
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[-]Repo support for 18.04[/-][+]Repo support for other Ubuntus[/+]vilmibm commentedon Sep 8, 2020
I've added all existing LTS versions to our deb repositories; please alert me if things are not working.
fivepapertigers commentedon Sep 21, 2020
Worked! thank you very much