Well, this is a simple answered question, from the title, but my real problem is hard af.

I have set ubuntu to use root, then it wouldn't let me log into the admin account only root and guest

I deleted the admin account, remade another, then attempted to disable root account.

This failed - I messed up the password, the original password was "root"

I also didn't set a password for my new admin account, so It says it has one, whats the default password for it?

I can't moderate my ubuntu system at all now. I have tried to drop to cmd shell thing, it asks for the root password, i type 'root' and any other possible passwords, it doesn't work.

To reset ubuntu to factory settings i have found that i could enter the following code:

sudo dpkg-reconfigure -phigh -a

sudo Requires admin password, that I cant find out without root password and I don;t know.

My goal is to try to fix this without remaking a bootable usb for ubuntu, because I lost the one i made for this. so If i can't, please say so. If you can help thanks!