: If you are using Windows Subsystem for Linux (WSL), ensure you aren't trying to mix manual Docker Engine installs with Docker Desktop for Windows , which can cause repository conflicts. Alternative: Remove and Start Over
: Newer versions of Ubuntu prefer keys in /etc/apt/keyrings rather than the old apt-key method, which is now deprecated. : If you are using Windows Subsystem for
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg Use code with caution. If the error persists, you can remove the
If the error persists, you can remove the problematic repository entry and re-add it cleanly: If the error persists
: sudo rm /etc/apt/sources.list.d/docker.list .
: Occasionally, local certificate issues prevent the initial download of the key. Updating your local certificates via Ubuntu's official package manager can resolve this: sudo apt-get install ca-certificates curl gnupg Use code with caution.