Note to self,

the x2go image is generated at the end of the d-i installation of a DebianEdu server.
While this is happening, the progress bar is not progressing and it take a (relatively) long time.
For the dlw (diskless workstation) the generation of the image is happening at the first boot of the server.

Task: move the generation of the image for x2go from d-i to the first boot.