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Add quick troubleshooting step (#13887) 

* Add quick troubleshooting step

If default umask isn't set with global read permissions, the keyring GPG file isn't found when updating the apt repos. The one liner command added will fix this issue.

* Fix grammar

Co-authored-by: Usha Mandya <47779042+usha-mandya@users.noreply.github.com>
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Ralph 2021-11-26 07:56:45 -05:00 committed by GitHub
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6
engine/install/debian.md
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@ -124,6 +124,12 @@ This procedure works for Debian on `x86_64` / `amd64`, `armhf`, `arm64`, and Ras
> `apt-get update` command always installs the highest possible version,
> which may not be appropriate for your stability needs.
> Receiving a GPG error when running `apt-get update`?
>
> Your default umask may not be set correctly, causing the public key file
> for the repo to not be detected. Run the following command and then try to
> update your repo again: `sudo chmod a+r /usr/share/keyrings/docker-archive-keyring.gpg`.
2. To install a _specific version_ of Docker Engine, list the available versions
in the repo, then select and install: