heh... at first reading of your title, it sounded like you were putting a linux installation on the Kobo!
I see you are just using linux as the system that transfers the SD card image to a new card.
So, a few questions. Do all Kobo devices use a removable SD card? Are there any downloadable images of the different Kobo SD cards in case of stuff-ups? Are there instructions for the different Kobo models on how to open the case without damaging it (mine is a KT) ?