The message "Failed to start docker-desktop.service: Unit docker-desktop.service is masked" indicates that the docker-desktop service is not able to start on Ubuntu because it is being managed by systemd and it has been "masked". Masking means that the service has been disabled or blocked from starting, often due to conflicts with other services or system configurations. To resolve this issue, you may need to unmask the docker-desktop service using the systemctl unmask command, or by modifying the systemd settings to allow it to run.
