Bug#780591: ltsp-client-builder fails when installing Debian Edu combined server in virtualbox environment

[Petter Reinholdtsen <pere@hungry.com>]

[Wolfgang Schweer]
>> It should definitely be removed; it is incompatible with the ltsp
>> packages in Jessie, and can lead to the exact sort of symptoms you're
>> experiencing...
>
> o.k.

This is the the script triggering the problem.  Probably should be
removed anyway, or at least disabled with newer ltsp versions.

>> Did you remove it manually, or from the installed debian-edu-config
>> package? The timing of removal may be significant.
>
> removed it inside target while software was installed before the LTSP 
> step happened. I guessed this would be early enough.
>
> d-i syslog up to the failure occurs is here (short time only):
> http://edu.schweer-online.de/syslog.bz2
>
> any idea?

I tested a usbstick install, and as far as I can tell, the failing mount
is the code in the udeb postinst:

if [ "$USE_CDROM" != "false" ] && [ ! -f /target/media/cdrom/.disk/info ]; then
    chroot /target mount /media/cdrom
    log "mounting /media/cdrom"
fi

I added 'set -x' at the top of the postinst script to figure out what is
going on.  I'm not sure why it fail.

-- 
Happy hacking
Petter Reinholdtsen