> I would very much like to understand your method for upgrading > a Raspberry Pi. I asked in the RPI support forum and was pointed to > a web post that explicitly says "upgrading" is not supported. > The only method to upgrade is to build a new image. I tried a scripted > upgrade one time and it failed. I'd be happy to take this off list.
I suggest you try a "vanilla Debian" image like those distributed by https://sd-card-images.johang.se/. Stefan PS: I wish this or something similar were "integrated" into the Debian project.

