I always set up root on Ubuntu. To do that, you log in as a user, then do a "su -" and your password. This puts you in as root with full root privileges. Then type "passwd". You will get a reply of 'password'. Type your new password for root twice. Then you can log in as root and use the root password.
The confusion factor I have with Ubuntu is if you are trying to do something as a user and you need root privileges, the system will ask for password. You need to give it your password as the system is setup to use sudo.
As for as turning off the security, it depends on the router, but someplace in the setup there should be a section for wireless. Within there, there should be something about setting up the password, and on my routers you can set the strength of the password, the password, and there is a check box saying no password. It probably will give you a nasty message saying this is not safe. Since this is only for troubleshooting, don't worry about it.
I may not have been clear on how to enter the password on your pc. The grouping as I mentioned is not indicated by the pc software. I found it by trial and error (several days ). You just enter the password on the pc in the various ways. You may or may not get error messages. The only sure way to rule out one of the methods is if the pc stops taking input in the password field.
If you are being asked for the security key, I don't think ndis wrapper will fix you problem. If you are being asked for the security key, that comes from the router, therefore you pc is talking to the router.
I found wireless is the most trouble to set up on Linux, any version and security makes it more of a problem. When I was trying to get mine setup, people would try to help, and many of the suggestions, I felt were duplicates of what I tried, or they didn't understand my problem. Just hang in there and I hope you don't think I'm insulting your intelligence as I thought at times about the people trying to help me.
I have procedures where I set up ndis wrapper on some other distribution, but I can't find it now. If you still have problems and need it, I’ll try to dig it out.
Good Luck
OldTechGuy