What is the error output of
You can't remove that. I looked and it is necessary to run. Unless you comment/remove every Line that is
YAYY! The issue of file permission/root stuff is bypassed. I think. Now we need to find out why serial isn't working.
You may want to try updating with Di_Update. There should be on your desktop a update icon. Click it and select your GoPiGo, update firmware, and also update software. Then try again.
If not should have been done anyway, so no harm done! I will also do some research when I get the time.