Interesting: trying to change the keyboard layout in the host system (OS X 10.8.5) to an English keyboard layout before installation (before each attempt I completely wiped the VirtualBox disk image and created a new one) did not help.
And by now I realised that the system does not actually boot into the half-baked/failed installation, but into the Live system instead.
Anyway, I then went on (in the Live system) to run "Install" -> Install on Harddisk, but this time I chose the language to be English (in the very first "dialog").
I was then able to properly choose the "Switzerland - German (Macintosh)" keyboard (previously I never got to see that screen!) and the installation continued without that "141" error.
I don't know whether it is the combination of my english (host) keyboard layout with the fact that I chose English as the language, or the fact that I chose English alone, or whether the reason was that I called the Installer from the Live system...
But that should give you some possible pointers to track it down :)
Interesting: trying to change the keyboard layout in the host system (OS X 10.8.5) to an English keyboard layout before installation (before each attempt I completely wiped the VirtualBox disk image and created a new one) did not help.
And by now I realised that the system does not actually boot into the half-baked/failed installation, but into the Live system instead.
Anyway, I then went on (in the Live system) to run "Install" -> Install on Harddisk, but this time I chose the language to be English (in the very first "dialog").
I was then able to properly choose the "Switzerland - German (Macintosh)" keyboard (previously I never got to see that screen!) and the installation continued without that "141" error.
I don't know whether it is the combination of my english (host) keyboard layout with the fact that I chose English as the language, or the fact that I chose English alone, or whether the reason was that I called the Installer from the Live system...
But that should give you some possible pointers to track it down :)