Rooting only working on W$
Finally I could *only* root the T1 if using a "native" W$ (in my case a W$ 7 64bit). The stuff in the "minimal-root" folder only has worked for me in this case and only in this.
That is, nothing happened from a W$ XP 32bit guest inside a VirtualBox running on a Linux KUbuntu Oneiric host.
And of course nothing has happened using the procedure of copying, from this Oneiric box, the contents of the sdcard folder to the /READER partition along with the PRS-T1 updater.package file and then pressing the HOME and the MENU buttons when booting (neither formatting the READER partition nor performing a hard reset did make any difference).
For now, then, the real fact is that I cannot say I've been able to root the T1 from my Linux box. That's why I suggested we could state from which operating system have we done the rooting procedure. Can it be done from a Linux box? Has anybody succeeded in it?