We usually need the following information to understand the issue:
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What platform are you using? Windows, Linux or macOS? Which version of the operating systems? In case of Linux, which distribution?
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How did you install Docker? Sharing the platform almost answers it, but only almost. Direct links to the followed guide can be useful.
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On debian based Linux, the following commands can give us some idea and recognize incorrectly installed Docker:
docker info docker versionReview 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
Furthermore, share the output of:
findmnt --target $(docker info --format '{{.DockerRootDir}}')
If findmnt is not available, install the util-linux package and try the command again.