I'm trying to install the Ubuntu16 into my embedded system. But my system only has serial console as the display output so ordinary methods seems not work. Is there a special image or a special tool for this case? Currently, I'm running a highly customized Ubuntu 14 in that system. Is that possible/hard to upgrade from that?
I also poked around and when it boots from usb key, I saw the following options. But when I try 'cli', it failed right away with 'No such file or directory'. Is it a deprecated option?
Available boot methods:
Start the installation -- this is the default option.
Start the installation in expert mode, for maximum control.
Minimal command-line system install.
Perform a memory test.