questions on user account

[Zhengguo Xu]

Hi all,

I had the impression that the user account created during the system
installation is sth. like "superuser" and its password like "super
password". so here come the questions

say i have user name XXX with password AAA created during ubuntu
installation, then i add a user YYY with password BBB and give it
administrator privilege. then I log in as YYY and delete the user XXX
(including all of its file and configuration) and only use YYY, is this
setting EXACTLY SAME as if i only have XXX (i mean for doing all the system
administration)?
thanks
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