Unable to install the bootloader

Hi!

Since Sunday I'm trying to provide you with an updated version of the apache 2.4 patch. Usually, the build takes ~ 3h on my machine, so I can perform one compilation per day, after work.

In recent days, I had trouble to create a running image, even from the current next. Even if the build is executed successfully, the image will not install on my virtual box machine with the error message "Unable to install the bootloader" (after it successfully partitioned the virtual hdd and copied the files).

Is this a known problem? Am I doing something wrong?

Best regards, Wolfgang