do-release-upgrade - upgrade operating system to latest release
Upgrade the operating system to the latest release from the command-line. This is the preferred command if the machine has no graphic environment or if the machine is to be upgraded over a remote connection.
show help message and exit
If using the latest supported release, upgrade to the development release
Try upgrading to the latest release using the upgrader from Ubuntu-proposed
-m MODE, --mode=MODE
Run in a special upgrade mode. Currently "desktop" for regular upgrades of a desktop system and "server" for server systems are supported.
-f FRONTEND, --frontend=FRONTEND
Run the specified frontend