Can use sudo apt update [duplicate]

Question

himanshu_chhatwal@Himanshu:~$ sudo apt update 
Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease                         
Hit:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease                 
Hit:3 https://ppa.launchpadcontent.net/blaze/rtbth-dkms/ubuntu jammy InRelease 
Hit:4 https://ppa.launchpadcontent.net/kiwixteam/release/ubuntu jammy InRelease
Hit:5 https://deb.nodesource.com/node_19.x jammy InRelease                     
Hit:6 http://packages.microsoft.com/repos/code stable InRelease                
Get:7 https://dl.yarnpkg.com/debian stable InRelease [17.1 kB]                 
Hit:8 https://dl.google.com/linux/chrome/deb stable InRelease                
Hit:9 http://security.ubuntu.com/ubuntu focal-security InRelease
Ign:10 http://security.ubuntu.com/ubuntu impish-security InRelease
Err:11 http://security.ubuntu.com/ubuntu impish-security Release
  404  Not Found [IP: 185.125.190.36 80]
Reading package lists... Done                                                  
E: The repository 'http://security.ubuntu.com/ubuntu impish-security 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.
W: https://dl.yarnpkg.com/debian/dists/stable/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target DEP-11-icons-small (main/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target DEP-11-icons-hidpi (main/dep11/[email protected]) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target DEP-11-icons-small (main/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target DEP-11-icons-hidpi (main/dep11/[email protected]) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list.d/focal-security.list:1`

please help me out as i am stuck

Answer 1

I see sources from three different releases, including one that is past End of Life. And repeats of many sources. And no less than five PPAs and other Non-Ubuntu sources. It's a testament to the skill Debian and Ubuntu developers that this patchwork monster boots at all.

Advice: Back up your data and start over with a clean slate and a fresh install. You have learned a lot from this iteration, carry those lessons to the next:

• Never mix sources from different releases of Ubuntu.
• Avoid PPAs and non-Ubuntu sources unless you know how to maintain them. Keep in mind that you might need to remove them (and all their packages) if they cause version conflicts.
• If you want newer software on an older LTS release, look for Snaps instead of PPAs or non-Ubuntu deb sources.
• Take a few minutes and learn how to curate your sources. Look at the format, the purpose of each file, the purpose of each repository, how those sources drive apt update, and how you can use your output to solve a lot of problems.