The AUR is a community-based location for PKGBUILDs, Arch's Install scripts.
There is a unofficial PKGBUILD for building and installing `gh` from the git repo.
https://aur.archlinux.org/packages/github-cli-git
Not sure if this is a common error or if this is the best way to describe the fix but thought I would add something to help others.
OS: Debian GNU/Linux 9.13 (stretch)
Error running first command of Debian install : `sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-key C99B11DEB97541F0`
Full error message:
```
Executing: /tmp/apt-key-gpghome.Fuep9VI9UN/gpg.1.sh --keyserver hkp://keyserver$
gpg: failed to start the dirmngr '/usr/bin/dirmngr': No such file or directory
gpg: connecting dirmngr at '/tmp/apt-key-gpghome.Fuep9VI9UN/S.dirmngr' failed: $
gpg: keyserver receive failed: No dirmngr
```
Reason: Missing dependency `dirmngr`
solution: install `dirmngr` by running: `sudo apt-get install dirmngr`
- Move all Linux installation docs to the separate page to eliminate repetition
- Indicate that only Ubuntu 20.04 is supported for apt-add-repository method
- Pull openSUSE/SUSE out of the "unofficial" section since it refers to
downloading our official packages
- Point out manual installation methods as well
