System damaged because of apt-get upgrade & Ubuntu Repos?

[trisec]

Well, I was shaving the yak when I did

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apt-get update

all went well so far, so I did

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apt-get upgrade

Then I realized, after it asked me to compare the file /etc/issue, that I have http://archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse repository switched on. But, as some changes were already made, I let it run through.

Have I made a mistake? And if so, should & how can I undo this (ctrl + z)?

I don't know if the repositories were there already, or if I inserted the repositories long time ago for a software far far away.
I have a Linux Mint 13 Maya with Cinnamon 64bit running. And I haven't shut it down, since running the (maybe unfortunate) upgrade.

[xenopeek]

Please share the output of the command:

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inxi -r

Also, please check your /etc/issue file:

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cat /etc/issue

It should be:

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Linux Mint 13 Maya \n \l

[trisec]

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alice@bob ~ $ inxi -r
Repos:     Active apt sources in file: /etc/apt/sources.list
           deb http://packages.linuxmint.com/ maya main upstream import
           deb http://archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse
           deb http://archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse
           deb http://security.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse
           deb http://archive.canonical.com/ubuntu/ precise partner
           deb http://packages.medibuntu.org/ precise free non-free
           Active apt sources in file: /etc/apt/sources.list.d/i2p-maintainers-i2p-precise.list
           deb http://ppa.launchpad.net/i2p-maintainers/i2p/ubuntu precise main
           deb-src http://ppa.launchpad.net/i2p-maintainers/i2p/ubuntu precise main

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alice@bob ~ $ cat /etc/issue
Linux Mint 13 Maya \n \l

[xenopeek]

All looks fine Unless you have any symptoms that would indicate damage to your system, both your inxi -r output and the contents of your /etc/issue file are in line with a clean install of Linux Mint 13 (except of course for the i2p-maintainers PPA you added).