Originally Posted by till
You have 2 options:
a) contact the hetzner support or
b) reboot your server in rescue mode and the run the command:
which will guide you trogh the setup. See hetzner wiki for details.
I always use b.
1) i have some of my servers at hetzner with debian -> no probem
2) i also always use b. (at https://robot.your-server.de/