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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
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
Download key from keyserver or keyserver pool
First, download the key from keyserver to local user storage:
gpg --keyserver keyserver.ubuntu.com --recv-keys D33A1BD725ED047D
Another keyserver: keys.openpgp.org
After that export key to file and put it to keyring directory:
gpg --export D33A1BD725ED047D |sudo tee /etc/apt/keyrings/usefulpackage.gpg
I didn't find out whether key should be ascii-armored or not. Most likely should be unarmored (binary).
Download key in file from developer's location
curl 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:
cat dbeaver.gpg | gpg --dearmor > dbeaver.gpg
Move the key to /etc/apt/keyrings:
mv dbeaver.gpg /etc/apt/keyrings/
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