I just ran into a similar problem adding new users using the users-admin tool.
What happens when you run:
Code:
sudo useradd -m -s /bin/bash newUserName
sudo passwd newUserName
That should create a new user successfully. As for the other stuff; I migrated to Linux Mint (which is a more stable version of Ubuntu) that doesn't break stuff on every software update. You might want to give it a try (I personally got tired of re-installing VMWare and wireless drivers every week --when a new kernel version is released).
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