In madershcramm's tutorial, he has these two steps.
Type [chmod +x sbf_flash] (ignore brackets) – this command makes sbf_flash an executable. If you've been rooting your phone with ADB Tools you've seen this command before.
Type [sudo ./sbf_flash [name of sbf file, starts with 'VRZ_']] (once again ignore the brackets) – this command runs the sbf_flash file. 'sudo' is the linux-y way of 'running as administrator' in Windows.
The first completes ok, but on the second, regarding the sbf_flash, "command not found". Booting from the Ubuntu 12.x CD. The current directory has sbf_flash and the sbf file.