Alexander Asteroth 写道：
> I tried “single” and 3.

Thanks!  ‘single’ *might* be worth supporting as an alias, 
although the preferred way to expose this would be a GRUB menu 
entry and the argument wouldn't matter.

> Now I tried —root and it still booted into gdm.

I don't see why it wouldn't.  ‘--root <file name>’ specifies the 
root device.

Kind regards,

T G-R