Docker is installed but isn't running on Ubuntu 22.04

[fj-de-torres]

I installed Docker Desktop on Ubuntu 22.04 LTS following the instructions on the official website. But even when Docker is running (both in the foreground and in the background), I still get the message 'Docker is installed but isn't running'. So DangerZone doesn't seem to be able to detect that Docker is actually running and I can't use it.