If you can't login tru any account, reboot in single mode adding a capital S to your boot command, or add "init=/bin/sh", or use the bootdisk/cd. Now restore your account's privileges to the previous state. You shouldn't be trying to mimic root's privileges with regular a user account, cuz the mistakes you will make affect the whole box, and not just ure user account.
And don't crosspost.
It's against netiquette, this site's policy and won't get you an answer any faster.
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