C'est fait, voilà ce que ça donne
axel@G3-3779:~$ find /etc/apt -type f -name '*.list*' -exec bash -c 'echo -e "\n$1\n"; [[ $1 = *".list" ]] && nl -ba "$1"' _ '{}' \;
/etc/apt/sources.list
1
2 # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
3 # newer versions of the distribution.
4 deb http://fr.archive.ubuntu.com/ubuntu/ focal main restricted
5
6 ## Major bug fix updates produced after the final release of the
7 ## distribution.
8 deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates main restricted
9 # deb-src http://fr.archive.ubuntu.com/ubuntu/ eoan-updates main restricted
10
11 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
12 ## team. Also, please note that software in universe WILL NOT receive any
13 ## review or updates from the Ubuntu security team.
14 deb http://fr.archive.ubuntu.com/ubuntu/ focal universe
15 deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates universe
16 # deb-src http://fr.archive.ubuntu.com/ubuntu/ eoan-updates universe
17
18 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
19 ## team, and may not be under a free licence. Please satisfy yourself as to
20 ## your rights to use the software. Also, please note that software in
21 ## multiverse WILL NOT receive any review or updates from the Ubuntu
22 ## security team.
23 deb http://fr.archive.ubuntu.com/ubuntu/ focal multiverse
24 deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates multiverse
25 # deb-src http://fr.archive.ubuntu.com/ubuntu/ eoan-updates multiverse
26
27 ## N.B. software from this repository may not have been tested as
28 ## extensively as that contained in the main release, although it includes
29 ## newer versions of some applications which may provide useful features.
30 ## Also, please note that software in backports WILL NOT receive any review
31 ## or updates from the Ubuntu security team.
32 deb http://fr.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
33 # deb-src http://fr.archive.ubuntu.com/ubuntu/ eoan-backports main restricted universe multiverse
34
35 ## Uncomment the following two lines to add software from Canonical's
36 ## 'partner' repository.
37 ## This software is not part of Ubuntu, but is offered by Canonical and the
38 ## respective vendors as a service to Ubuntu users.
39 # deb http://archive.canonical.com/ubuntu eoan partner
40 # deb-src http://archive.canonical.com/ubuntu eoan partner
41
42 deb http://security.ubuntu.com/ubuntu focal-security main restricted
43 # deb-src http://security.ubuntu.com/ubuntu eoan-security main restricted
44 deb http://security.ubuntu.com/ubuntu focal-security universe
45 # deb-src http://security.ubuntu.com/ubuntu eoan-security universe
46 deb http://security.ubuntu.com/ubuntu focal-security multiverse
47 # deb-src http://security.ubuntu.com/ubuntu eoan-security multiverse
48
49 # This system was installed using small removable media
50 # (e.g. netinst, live or single CD). The matching "deb cdrom"
51 # entries were disabled at the end of the installation process.
52 # For information about how to configure apt package sources,
53 # see the sources.list(5) manual.
/etc/apt/sources.list.save
/etc/apt/sources.list.d/ubuntuhandbook1-ubuntu-audacity-eoan.list.distUpgrade
/etc/apt/sources.list.d/steam.list.distUpgrade
/etc/apt/sources.list.d/steam.list
1 # deb [arch=amd64,i386] http://repo.steampowered.com/steam/ precise steam # désactivé pour la mise à niveau vers focal
2 # deb-src [arch=amd64,i386] http://repo.steampowered.com/steam/ precise steam # désactivé pour la mise à niveau vers focal
/etc/apt/sources.list.d/brave-browser-release.list.distUpgrade
/etc/apt/sources.list.d/brave-browser-release.list.save
/etc/apt/sources.list.d/gezakovacs-ubuntu-ppa-eoan.list
1 # deb http://ppa.launchpad.net/gezakovacs/ppa/ubuntu focal main # désactivé pour la mise à niveau vers focal
2 # deb-src http://ppa.launchpad.net/gezakovacs/ppa/ubuntu eoan main
/etc/apt/sources.list.d/gezakovacs-ubuntu-ppa-eoan.list.save
/etc/apt/sources.list.d/spotify.list.save
/etc/apt/sources.list.d/spotify.list
1 # deb http://repository.spotify.com stable non-free # désactivé pour la mise à niveau vers focal
/etc/apt/sources.list.d/ubuntuhandbook1-ubuntu-audacity-eoan.list.save
/etc/apt/sources.list.d/brave-browser-release.list
1 deb [arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main
/etc/apt/sources.list.d/lutris-team-ubuntu-lutris-focal.list.save
/etc/apt/sources.list.d/gezakovacs-ubuntu-ppa-eoan.list.distUpgrade
/etc/apt/sources.list.d/steam.list.save
/etc/apt/sources.list.d/lutris-team-ubuntu-lutris-focal.list
1 deb http://ppa.launchpad.net/lutris-team/lutris/ubuntu focal main
2 # deb-src http://ppa.launchpad.net/lutris-team/lutris/ubuntu focal main
/etc/apt/sources.list.d/ubuntuhandbook1-ubuntu-audacity-eoan.list
1 # deb http://ppa.launchpad.net/ubuntuhandbook1/audacity/ubuntu focal main # désactivé pour la mise à niveau vers focal
2 # deb-src http://ppa.launchpad.net/ubuntuhandbook1/audacity/ubuntu eoan main
/etc/apt/sources.list.d/spotify.list.distUpgrade
/etc/apt/sources.list.distUpgrade
