J'ai refait la commande après avoir supprimé les non-free mais pour l'info Artfull elle provient d'un mirror list qui n'a rien à faire là je crois...
find /etc/apt -name '*.list' -exec bash -c 'echo -e "\n$1\n"; nl -ba "$1"' _ '{}' \;
/etc/apt/sources.list.d/visionworks-repo.list
1 deb-src file:///var/visionworks-repo /
2 deb file:///var/visionworks-repo /
/etc/apt/sources.list.d/cuda-10-0-local-10.0.326-cross-aarch64.list
1 deb file:///var/cuda-repo-10-0-local-10.0.326-cross-aarch64 /
/etc/apt/sources.list.d/cybermax-dexter-ubuntu-sdl2-backport-bionic.list
1 deb [url]http://ppa.launchpad.net/cybermax-dexter/sdl2-backport/ubuntu[/url] bionic main
2 # deb-src [url]http://ppa.launchpad.net/cybermax-dexter/sdl2-backport/ubuntu[/url] bionic main
/etc/apt/sources.list.d/cappelikan-ubuntu-ppa-bionic.list
1 deb [url]http://ppa.launchpad.net/cappelikan/ppa/ubuntu[/url] bionic main
2 # deb-src [url]http://ppa.launchpad.net/cappelikan/ppa/ubuntu[/url] bionic main
/etc/apt/sources.list.d/visionworks-sfm-repo.list
1 deb-src file:///var/visionworks-sfm-repo /
2 deb file:///var/visionworks-sfm-repo /
/etc/apt/sources.list.d/microsoft-prod.list
1 deb [arch=amd64] [url]https://packages.microsoft.com/ubuntu/18.04/prod[/url] bionic main
/etc/apt/sources.list.d/cuda-10-2-local-10.2.89-cross-aarch64.list
1 deb file:///var/cuda-repo-10-2-local-10.2.89-cross-aarch64 /
/etc/apt/sources.list.d/freecad-maintainers-ubuntu-freecad-stable-bionic.list
1 deb [url]http://ppa.launchpad.net/freecad-maintainers/freecad-stable/ubuntu[/url] bionic main
2 # deb-src [url]http://ppa.launchpad.net/freecad-maintainers/freecad-stable/ubuntu[/url] bionic main
/etc/apt/sources.list.d/cuda-10-0-local-10.0.326-410.108.list
1 deb file:///var/cuda-repo-10-0-local-10.0.326-410.108 /
/etc/apt/sources.list.d/wine-obs.list
1 # deb [url]http://download.opensuse.org/repositories/Emulators:/Wine:/Debian/xUbuntu_18.04[/url] ./
/etc/apt/sources.list.d/visionworks-tracking-repo.list
1 deb-src file:///var/visionworks-tracking-repo /
2 deb file:///var/visionworks-tracking-repo /
/etc/apt/sources.list.d/canonical-hwe-team-ubuntu-backport-iwlwifi-bionic.list
1 deb [url]http://ppa.launchpad.net/canonical-hwe-team/backport-iwlwifi/ubuntu[/url] bionic main
2 # deb-src [url]http://ppa.launchpad.net/canonical-hwe-team/backport-iwlwifi/ubuntu[/url] bionic main
/etc/apt/sources.list.d/cuda-10-2-local-10.2.89-440.40.list
1 deb file:///var/cuda-repo-10-2-local-10.2.89-440.40 /
/etc/apt/sources.list
1 # deb cdrom:[Ubuntu-MATE 18.04.4 LTS _Bionic Beaver_ - Release amd64 (20200203.1)]/ bionic main multiverse restricted universe
2
3 # See [url]http://help.ubuntu.com/community/UpgradeNotes[/url] for how to upgrade to
4 # newer versions of the distribution.
5 deb [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic main restricted
6 # deb-src [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic main restricted
7
8 ## Major bug fix updates produced after the final release of the
9 ## distribution.
10 deb [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic-updates main restricted
11 # deb-src [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic-updates main restricted
12
13 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
14 ## team. Also, please note that software in universe WILL NOT receive any
15 ## review or updates from the Ubuntu security team.
16 deb [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic universe
17 # deb-src [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic universe
18 deb [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic-updates universe
19 # deb-src [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic-updates universe
20
21 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
22 ## team, and may not be under a free licence. Please satisfy yourself as to
23 ## your rights to use the software. Also, please note that software in
24 ## multiverse WILL NOT receive any review or updates from the Ubuntu
25 ## security team.
26 deb [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic multiverse
27 # deb-src [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic multiverse
28 deb [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic-updates multiverse
29 # deb-src [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic-updates multiverse
30
31 ## N.B. software from this repository may not have been tested as
32 ## extensively as that contained in the main release, although it includes
33 ## newer versions of some applications which may provide useful features.
34 ## Also, please note that software in backports WILL NOT receive any review
35 ## or updates from the Ubuntu security team.
36 deb [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic-backports main restricted universe multiverse
37 # deb-src [url]http://fr.archive.ubuntu.com/ubuntu/[/url] bionic-backports main restricted universe multiverse
38
39 ## Uncomment the following two lines to add software from Canonical's
40 ## 'partner' repository.
41 ## This software is not part of Ubuntu, but is offered by Canonical and the
42 ## respective vendors as a service to Ubuntu users.
43 # deb [url]http://archive.canonical.com/ubuntu[/url] bionic partner
44 # deb-src [url]http://archive.canonical.com/ubuntu[/url] bionic partner
45
46 deb [url]http://security.ubuntu.com/ubuntu[/url] bionic-security main restricted
47 # deb-src [url]http://security.ubuntu.com/ubuntu[/url] bionic-security main restricted
48 deb [url]http://security.ubuntu.com/ubuntu[/url] bionic-security universe
49 # deb-src [url]http://security.ubuntu.com/ubuntu[/url] bionic-security universe
50 deb [url]http://security.ubuntu.com/ubuntu[/url] bionic-security multiverse
51 # deb-src [url]http://security.ubuntu.com/ubuntu[/url] bionic-security multiverse
52 deb [url]https://dl.winehq.org/wine-builds/ubuntu/[/url] bionic main
53 # deb-src [url]https://dl.winehq.org/wine-builds/ubuntu/[/url] bionic main