Ok so now I tried again to follow the whole procedure from the beginning after reflash with PR 1.3, and I still get the error. I really don't know what is wrong: it is the third time I follow each step of the how-to on Post #57, and I always get the same mounting error. This time I replaced the opensh commands with ariadne, as I use Inception 0.2 with PR 1.3, but no more success.