Error saving credentials: error storing credentials - err: exit status 1, out: `error getting credentials - err: exit status 1, out: `exit status 2: gpg: decryption failed: No secret key``

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Is this related to the authentication issue with the gpg error? Do you still have that?

If I understand you correcttly, you installed Docker on Arch Linux, then installed Docker Desktop. Docker Desktop create a virtual machine and adds a new Docker client. It can also change how the client authenticates. You can switch between Docker Desktop and the Docker daemon installed on the host by changing the context:

docker context ls
docker context use CONTEXTNAME

When you use sudo su, you have different contexts without docker desktop.

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