While I don't recommend using a distro that old here is how to fix the issue.
https://askubuntu.com/questions/91815/how-to-install-software-or-upgrade-from-an-old-unsupported-release
http://old-releases.ubuntu.com/ubuntu/dists/
They have things going back to Breezy.

On Fri, Mar 16, 2018 at 12:04 AM, <wofgdkncxojef@gmail.com> wrote:
On Friday 16 March 2018 02:13:07 dep wrote:
> so, to see if i could do it, i've flashed ubuntu 13.04 to a 2012 asus nexus
> tablet. to my surprise, wifi and such work. *not* to my surprise, i hate
> hate hate the ubuntu default desktop and want to replace it as soon as i
> can.
>
> after some poking around (made more interesting by an onscreen keyboard
> that comes and goes as it wishes, irrespective of whether text needs to be
> entered, which is annoying when you don't need it and maddening when you
> do), i got a terminal running and sought to install some of the
> essentials. (by tradition, the first thing i install on a new linux system
> is mc, because it is the best tool to get me out of whatever trouble i get
> myself into.) and i discovered that all the repositories are now 404. am
> hoping to find someplace where they are archived so as to severely edit my
> sources list and get, among other things, tde. the corresponding debian
> distro is raring.
>
> it does sort of run (though about half the stuff is canonical trying to
> sell me music and stuff, which i think they've stopped doing anyway) but
> without a decent desktop i can't imagine how i can put it through its
> paces. and yes, the icons are tiny, beyond the fact that ubuntu touch
> kinds sucks in general. in tde i can make the icons bigger.
>
> i'm hoping to justify the expenditure of time . . . and tun tde on a
> tablet.

13.04 is 5 years old....
18.04 beta doesn't work? (you might want to skip 16.04 at this point)

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