do-release-upgrade - manual page for do-release-upgrade
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
Check if upgrading to the latest devel release is
Try upgrading to the latest release using the upgrader
-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.