I just installed Debian Stretch from a live USB. I left the installation do all the partition and such automatically. But I reboot to a black screen that says:

> Minimal BASH-like line editing is supported...

In which direction should I go now?

**EDIT:**

I can boot every time if I type this cryptic arcane I blindly copied from a forum:

> set root=(hd0,gpt2)

> linux /boot/vmlinuz-3.16.0-4-amd64 root=/dev/sda2 ro

> initrd /boot/initrd.img-3.16.0-4-amd64

> boot

It also works when I type

> exit

And then there is a boot manager and I can choose "OS boot Manager (UEFI) - Debian(...)" and it boots.

How can I do those changes permanent? I'm almost there.