Docker compose can't map directory on under the root

We usually need the following information to understand the issue:

  1. How did you install Docker? Sharing the platform almost answers it, but only almost. Direct links to the followed guide can be useful.

  2. On debian based Linux, the following commands can give us some idea and recognize incorrectly installed Docker:

    docker info
    docker version
    

    Review the output before sharing and remove confidential data if any appears (public IP for example)

    dpkg -l | grep docker
    snap list docker
    

When you share the outputs, always format your posts according to the following guide: How to format your forum posts