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I noticed that the username I used to install Ubuntu got added to a bunch of groups in the /etc/group file. I'm getting rid of unneeded accounts. Would anything break if I removed that first account?

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A user needs to be in the audio group to use the sound card, as one example. It would make more sense to edit the group file with a text editor, and put your main user in every group the original user was in.

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If you've enabled logging in as root then no. Otherwise you will need at least one user in the admin group so that you have an account able to become root.

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