After installation of Bionic the system says it's Linux Mint 18.3?

[cogitans]

I’ve been using Linux Mint for several years now. But now I decided to go to Ubuntu as the terms of Ubuntu changed.


So I downloaded “ubuntu-18.04-desktop-amd64.iso” and installed it. I installed a few programs that I’m fond of.


But now i began optimizing the system itself. And now things slowly began to confuse me. Several places the system told me that my system is Linux Mint 18.3. That’s pretty strange to say the least. I did a format of my partition when I did the install so leftover files from Linux Mint can’t be the issue.


I compared the 2 files from Ubuntu and Linux Mint. They aren’t of the same name and my used iso-file is of the same name that Ubuntu presents.


I did several systemcalls:


“cat /etc/lsb-release”
->
DISTRIB_ID=LinuxMint
DISTRIB_RELEASE=18.3
DISTRIB_CODENAME=sylvia
DISTRIB_DESCRIPTION=“Linux Mint 18.3 Sylvia”


“head -11 /usr/share/mintsources/rebecca/mintsources.conf”
->
[general]
description=Linux Mint 17.1 "Rebecca"
codename=rebecca
base_codename=trusty
use_ppas=true

[mirrors]
default=http://packages.linuxmint.com
base_default=http://archive.ubuntu.com/ubuntu
mirrors=/usr/share/python-apt/templates/LinuxMint.mirrors
base_mirrors=/usr/share/python-apt/templates/Ubuntu.mirrors


I was almost sure that somehow I got the iso of Linux Mint downloaded and installed and I was just about to do a redownload and install everything from scratch…again.


Then I wanted to make sure that the visuals agreed on my discoveries. And on
https://www.ubuntu.com/desktop
then desktop of Ubuntu looks just the same as my desktop although my system states that I’m using Linux Mint 18.3.


What’s going on here?
Has the mirrors of Ubuntus downloads been tampered with so some are pointing to Linux Mints servers?
How come the visuals are the same concerning the desktop?
I did all of these discoveries as I somehow noticed that there was a folder named “linuxmint” in “/usr/lib/linuxmint/mintSources/mintSources.py” during my updates. That’s pretty strange, too, if I’m on Ubuntu Bionic.

What’s going on here???


PS:
I’ve got my Home-directory on a partition separate from the main system. It shouldn’t have any influenze on the systemfiles on my systempartition. But I though it was worth mentioning that my Home-folder is the only thing I’ve got from my old Linux Mint (with some configuration-files on it).


PPS:
Oh, by the way: as the iso of Ubuntu 18.04 destroyed my GRUB during installation (several attempts) and as “boot-repair” wasn’t able to fix it I installed the system from an iso of Ubuntu 16.04 and did a distribution-upgrade.

PPPS:
The command "cat /etc/apt/sources.list" states this confusing output:

# deb cdrom:[Ubuntu 16.04.4 LTS _Xenial Xerus_ - Release amd64 (20180228)]/ xenial main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://dk.archive.ubuntu.com/ubuntu/ bionic main restricted
# deb-src http://dk.archive.ubuntu.com/ubuntu/ xenial main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://dk.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
# deb-src http://dk.archive.ubuntu.com/ubuntu/ xenial-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://dk.archive.ubuntu.com/ubuntu/ bionic universe
# deb-src http://dk.archive.ubuntu.com/ubuntu/ xenial universe
deb http://dk.archive.ubuntu.com/ubuntu/ bionic-updates universe
# deb-src http://dk.archive.ubuntu.com/ubuntu/ xenial-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://dk.archive.ubuntu.com/ubuntu/ bionic multiverse
# deb-src http://dk.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://dk.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
# deb-src http://dk.archive.ubuntu.com/ubuntu/ xenial-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://dk.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src http://dk.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
#-->>deb http://archive.canonical.com/ubuntu xenial partner
# deb-src http://archive.canonical.com/ubuntu xenial partner

deb http://security.ubuntu.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
deb http://security.ubuntu.com/ubuntu bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu xenial-security universe
deb http://security.ubuntu.com/ubuntu bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse

[jeremy31]

Duplicate of https://ubuntuforums.org/showthread.php?t=2391687
Closed