Originally Posted by frankbell
Glad you got it fixed and thanks for the update!
As an aside, I think a post containing only the words "user error" is a bit harsh and does not contribute to answering a Linux Question. We all make user errors; that's why there is a CTRL-Z.
Making mistakes is how we learn. I congratulate OP for being dogged enough to fix this and learn from it.
Although it wasn't intended as a dig at the OP, we've all been there and done that.
I was a bit late to the party and, reading through the thread, it seems that there is simply confusion about which password should be used for sudo and su respectively.
If Ubuntu is the choice of OS, it should probably be used as intended, rather than circumventing the built in administrative mechanisms, and either just "getting it wrong" or in fact breaking the system in the process.
I've got nothing against trial and error, but in this case a bit of cursory reading of the introductory docs would have saved the OP considerable amount of time.
Just "reinstalling until it works" is not going to be of much benefit to the learning experience, now or in the future, and learning the value of documentation should be a primary lesson for a new user.