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

The key MUST NOT be placed in /etc/apt/trusted.gpg.d or loaded by apt-key add

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.

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

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

Instructions to connect to a third-party repository

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