> I wonder why is that first PPA on my system, I've never added it.

I have no idea how a PPA could have gotten added without you adding it
yourself. 

> I also
> want to say that I can't delete it with ppa-purge.

That's also weird. Try opening Control Center -> Software & Updates and
go to the "Other Software" tab and try to delete the PPA there. If that
doesn't work then cd into /etc/apt/sources.list.d, see if it shows up
there, and if so delete that file.

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