installer no longer signals success or offer reboot

[Ricardo Wurmus]

I built the installer image with commit
2f49007dd076b14feb40d7c3331dee3e737265c8 and tried to install a server
with it.

It worked but at the end of the installation when it prompted me to hit
Return it did not tell me that the installation was successful and that
I could reboot.  Instead it brought me right back to the language
selection of the installer.

(One of the systems that I installed like this also has a weird problem.
Any guix command tells me that a glibc patch is missing.  I’ll see if
it’s the same with this server I just installed and report a bug.)

-- 
Ricardo