Usage: dpkg-trigger [<option>...] <trigger-name>
       dpkg-trigger [<option>...] <command>

Commands:
      --check-supported
          Check if the running dpkg supports triggers.
  -?, --help
          Show this help message.
      --version
          Show the version.

Options:
      --by-package=<package>
          Override trigger awaiter package (normally set by dpkg).
      --await
          Package needs to await the processing.
      --no-await
          No package needs to await the processing.
      --no-act
          Print what would be done, but perform no action.
      --admindir=<directory>
          Change the database directory.
          [default: /var/lib/dpkg]
      --root=<directory>
          Change the root directory.
          [default: /]