With QTparted steps 1 to 3d you always say made partiton of 1,360Mb, if it is saying it needs at least 2 gb, why are you makeing 1.36Gb ?

After you change parititon size or any thing are you pressing &commit ? Are you rebooting after partition changes ?

At step 3f you do finaly say you made a partition of 12g. but your errors say differently, and again did you &commit in QTparted and reboot between makeing partition and format ?
"I need to have a partition with at least 2 Gbytes of free space,"

BTW: I'm also new to Linux.