As root, I was able to do startx to go into the GUI. I was able to see the user accounts and it appears all the user accounts have been set to "Custom". I remember while uninstalling dtc, I unknowingly said yes to managing account information manually. This is definitely the problem but unfortunately I have no clues about how to fix it. I googled but did not get any specific information. If only I can reset the account type to the ubuntu defaults, that will be great.
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