Can someone help me please how to repair all those errors? Thank you.
~$ sudo apt-get update
Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Ign:5 http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu focal InRelease
Hit:6 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Ign:7 http://us.archive.ubuntu.com/ubuntu saucy InRelease
Err:8 http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu focal Release
404 Not Found [IP: 91.189.95.85 80]
Ign:9 http://us.archive.ubuntu.com/ubuntu saucy-updates InRelease
Err:10 http://us.archive.ubuntu.com/ubuntu saucy Release
404 Not Found [IP: 91.189.91.38 80]
Err:11 http://us.archive.ubuntu.com/ubuntu saucy-updates Release
404 Not Found [IP: 91.189.91.38 80]
Hit:12 https://packagecloud.io/AtomEditor/atom/any any InRelease
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://us.archive.ubuntu.com/ubuntu saucy Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://us.archive.ubuntu.com/ubuntu saucy-updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Later edit 1/2:
@stdcerr
~$ sudo apt update
Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Get:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:4 http://security.ubuntu.com/ubuntu focal-security InRelease [109 kB]
Ign:5 http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu focal InRelease
Err:6 http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu focal Release
404 Not Found [IP: 91.189.95.85 80]
Get:7 http://archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Hit:8 https://packagecloud.io/AtomEditor/atom/any any InRelease
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
:~$ cat /etc/apt/sources.list
# Automatically generated by Calamares on 2020-12-24.
# Lines starting with "deb" are mandatory, while lines starting with "deb-src"
# are for more detailed package information.
## See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
## newer versions of Lubuntu.
deb http://archive.ubuntu.com/ubuntu/ focal main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ focal main restricted
## Major bug fix updates produced after the final release of Lubuntu.
## Have you noticed a regression? Please report it!
## https://wiki.ubuntu.com/StableReleaseUpdates#Regressions
deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ focal-updates main restricted
## 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 directly. Updates in this repository
## are provided by volunteers, but most come from Debian.
deb http://archive.ubuntu.com/ubuntu/ focal universe
# deb-src http://archive.ubuntu.com/ubuntu/ focal universe
deb http://archive.ubuntu.com/ubuntu/ focal-updates universe
# deb-src http://archive.ubuntu.com/ubuntu/ focal-updates universe
## Software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu team,
## and may not be under a free licence. Please satisfy yourself as 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 directly.
deb http://archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ focal multiverse
deb http://archive.ubuntu.com/ubuntu/ focal-updates multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ focal-updates multiverse
## Software from this repository contains tested security updates from the
## Ubuntu security team.
deb http://security.ubuntu.com/ubuntu focal-security main restricted
# deb-src http://security.ubuntu.com/ubuntu focal-security main restricted
deb http://security.ubuntu.com/ubuntu focal-security universe
# deb-src http://security.ubuntu.com/ubuntu focal-security universe
deb http://security.ubuntu.com/ubuntu focal-security multiverse
# deb-src http://security.ubuntu.com/ubuntu focal-security multiverse
## Software from this repository may not have been tested as extensively as
## software 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://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
deb [arch=amd64] https://packagecloud.io/AtomEditor/atom/any/ any main
# deb-src [arch=amd64] https://packagecloud.io/AtomEditor/atom/any/ any main
Later edit 2/2
@laurent
sudo add-apt-repository --remove ppa:ubuntu-sdk-team/ppa
:~$ sudo apt update
Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Get:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:4 http://security.ubuntu.com/ubuntu focal-security InRelease [109 kB]
Get:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Hit:6 https://packagecloud.io/AtomEditor/atom/any any InRelease
Fetched 324 kB in 2s (172 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
