This error message is indicating that the snapd service is not running on the localhost. Snapd is a service that manages and interacts with snaps on Linux systems.
To resolve the issue, you can try restarting the snapd service on your system. You can do this by using the following command in a terminal:
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sudo systemctl restart snapd
If the service is still not running, you can try reinstalling the snapd package using the following command:
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sudo apt-get install --reinstall snapd
If the issue persists, it may be helpful to check the logs for the snapd service to determine the cause of the issue. You can do this by using the following command:
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journalctl -u snapd