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Modernize apt installation instructions and improve security (#192)

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Modern Debian-derived distributions will issue a deprecation warning for
the usage of apt-key add as listed here.  Additionally, by using that
apt-key command, the given key is recognized as valid for all
repositories in /etc/apt/sources.list* -- not just this one.

By using the more modern mechanism, we can avoid that warning and also
import this key in such a way that it is only valid for this repository.

Other projects are also using this method; for instance:

https://apt.syncthing.net/

This post explains the security risks of apt-key:
https://blog.cloudflare.com/dont-use-apt-key/
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John Goerzen 2022-04-17 05:45:00 -05:00 committed by GitHub
parent 8e41549f9b
commit 6c4eb4f361
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installation-linux-deb.md
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@ -22,13 +22,14 @@ sudo apt-get install dirmngr
Then import the repository key to your `gpg` keyring and export it to your
`apt` keyring:
```
sudo mkdir -p /usr/local/apt-keys
gpg --fetch-keys https://neilalexander.s3.dualstack.eu-west-2.amazonaws.com/deb/key.txt
gpg --export 569130E8CA20FBC4CB3FDE555898470A764B32C9 | sudo apt-key add -
gpg --export 569130E8CA20FBC4CB3FDE555898470A764B32C9 | sudo tee /usr/local/apt-keys/yggdrasil-keyring.gpg > /dev/null
```
Add the repository into your `apt` sources:
```
echo 'deb http://neilalexander.s3.dualstack.eu-west-2.amazonaws.com/deb/ debian yggdrasil' | sudo tee /etc/apt/sources.list.d/yggdrasil.list
echo 'deb [signed-by=/usr/local/apt-keys/yggdrasil-keyring.gpg] http://neilalexander.s3.dualstack.eu-west-2.amazonaws.com/deb/ debian yggdrasil' | sudo tee /etc/apt/sources.list.d/yggdrasil.list
sudo apt-get update
```