1. "Docker not installed"
Click "Install Docker" at the top of the Docker panel — it auto falls back to China mirrors if the official source is unreachable.
2. Ghost can't be accessed remotely
Ghost only allows localhost by default. One-click install auto-sets the url; if accessed via NAT/domain, change the url to the public address or domain.
3. Drupal: translations directory not writable
One-click install auto-creates and authorizes that directory; for manual installs, run chown -R www-data:www-data sites/default/files.
4. Can't connect to the database
Use the container-network hostname (e.g. sshe-mysql), not localhost.