# uname -a
Linux c3plus-home 5.11.0-46-generic #51~20.04.1-Ubuntu SMP Fri Jan 7 06:51:40 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

# lsb_release -a
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.3 LTS
Release:	20.04
Codename:	focal

# dpkg --print-architecture
amd64

# dpkg --print-foreign-architectures
i386

# cat /etc/apt/sources.list
# deb cdrom:[Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731)]/ focal main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu focal main restricted multiverse
# deb-src http://by.archive.ubuntu.com/ubuntu/ focal main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu focal-updates main restricted multiverse
# deb-src http://by.archive.ubuntu.com/ubuntu/ focal-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://archive.ubuntu.com/ubuntu focal universe
# deb-src http://by.archive.ubuntu.com/ubuntu/ focal universe
deb http://archive.ubuntu.com/ubuntu focal-updates universe
# deb-src http://by.archive.ubuntu.com/ubuntu/ focal-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-src http://by.archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://by.archive.ubuntu.com/ubuntu/ focal-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://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
# deb-src http://by.archive.ubuntu.com/ubuntu/ focal-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 focal partner
# deb-src http://archive.canonical.com/ubuntu focal partner
deb http://archive.ubuntu.com/ubuntu focal-security main restricted multiverse
# deb-src http://security.ubuntu.com/ubuntu focal-security main restricted
deb http://archive.ubuntu.com/ubuntu focal-security universe
# deb-src http://security.ubuntu.com/ubuntu focal-security universe
# deb-src http://security.ubuntu.com/ubuntu focal-security multiverse
# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.
# deb http://linux.teamviewer.com/deb stable main
# deb [arch=amd64] https://repo.fortinet.com/repo/6.4/ubuntu/ /focal multiverse

# cat /etc/apt/sources.list.d/*
deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main
deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main
deb http://ppa.launchpad.net/flatpak/stable/ubuntu focal main
# deb-src http://ppa.launchpad.net/flatpak/stable/ubuntu focal main
deb http://ppa.launchpad.net/flatpak/stable/ubuntu focal main
# deb-src http://ppa.launchpad.net/flatpak/stable/ubuntu focal main
###   TeamViewer DEB repository list
deb https://linux.teamviewer.com/deb stable main
# deb https://linux.teamviewer.com/deb preview main
# deb https://linux.teamviewer.com/deb development main
###   TeamViewer DEB repository list
deb https://linux.teamviewer.com/deb stable main
# deb https://linux.teamviewer.com/deb preview main
# deb https://linux.teamviewer.com/deb development main
deb http://ppa.launchpad.net/videolan/stable-daily/ubuntu focal main
# deb-src http://ppa.launchpad.net/videolan/stable-daily/ubuntu focal main
deb http://ppa.launchpad.net/videolan/stable-daily/ubuntu focal main
# deb-src http://ppa.launchpad.net/videolan/stable-daily/ubuntu focal main