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====== How to add 3rd party repository in Ubuntu ======
Things become more and more complicated, so I decided to write instruction

===== Add signing key for repository =====
You should always put signing key path to repository, like this:
  deb [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_16.x jammy main

<WRAP center round important 60%>
The key MUST NOT be placed in ///etc/apt/trusted.gpg.d// or loaded by //apt-key add//
</WRAP>

<WRAP center round info 60%>
If future updates to the key will be managed by an apt/dpkg package, then it SHOULD be downloaded into ///usr/share/keyrings// using the same filename that will be provided by the package. If it will be managed locally, it SHOULD be downloaded into ///etc/apt/keyrings// instead.
</WRAP>

I think it means if you need to bother with key, then just put it to ///etc/apt/keyrings//

===== Using new .sources =====
.sources file instead of a .list file. This method is relatively new, and uses the deb822 multiline format that is less ambiguous compared to the deb . . . declaration, though is functionally identical. Create a new file:
  Types: deb
  Architectures: amd64 arm64
  Signed-By: /usr/share/keyrings/nodesource.gpg
  URIs: https://deb.nodesource.com/node_16.x
  Suites: jammy
  Components: main
 
===== How to get the key =====
There are two ways, depending on what package developer implemented

==== 1. Download key from keyserver or keyserver pool ====
  sudo gpg --homedir /tmp --no-default-keyring --keyring /etc/apt/keyrings/usefulpackage.gpg --keyserver \
  keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB6517111119E084DAB9

==== 2. Download key in file from developer's location ====
  curl -fsSL https://dbeaver.io/debs/dbeaver.gpg.key > dbeaver.gpg
Check if key is armored (looks like ASCII text and not binary), and if so, unarmor it:
  curl -fsSL https://dbeaver.io/debs/dbeaver.gpg.key | gpg --dearmor -o dbeaver.gpg
Move the key to ///etc/apt/keyrings//:
  mv dbeaver.gpg /etc/apt/keyrings/

===== Links =====
  * [[https://wiki.debian.org/DebianRepository/UseThirdParty|Instructions to connect to a third-party repository]]

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