Linux Lite Forums

===========================
Install Updates Error log
===========================
Install Updates could not fetch the package cache information lists.
Go to https://www.linuxliteos.com/forums/ and paste the log below into a new or existing thread for assistance.

============ Log ===========

Ign:1 http://dl.google.com/linux/chrome-remote-desktop/deb stable InRelease
Hit:2 https://mirrors.sjtug.sjtu.edu.cn/linuxliteos emerald InRelease
Hit:3 http://archive.canonical.com/ubuntu focal InRelease
Hit:4 http://security.ubuntu.com/ubuntu focal-security InRelease
Ign:5 http://ppa.launchpad.net/webupd8team/ind...ect/ubuntu ./ InRelease
Hit:6 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:7 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:8 https://brave-browser-apt-release.s3.brave.com stable InRelease
Hit:9 http://dl.google.com/linux/chrome-remote-desktop/deb stable Release
Hit:10 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:11 https://repo.windscribe.com/debian buster InRelease
Hit:12 https://linux.teamviewer.com/deb stable InRelease
Hit:13 http://ppa.launchpad.net/ubuntudde-dev/stable/ubuntu focal InRelease
Hit:14 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:15 http://ppa.launchpad.net/vala-team/ppa/ubuntu focal InRelease
Get:16 https://archive.linux.duke.edu/cran/bin/...nic-cran35 ./ InRelease [3,626 B]
Ign:18 http://ppa.launchpad.net/webupd8team/ind...ect/ubuntu focal InRelease
Err:19 http://ppa.launchpad.net/webupd8team/ind...ect/ubuntu ./ Release
  404  Not Found [IP: 2001:67c:1560:8008::19 80]
Err:16 https://archive.linux.duke.edu/cran/bin/...nic-cran35 ./ InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9
Err:20 http://ppa.launchpad.net/webupd8team/ind...ect/ubuntu focal Release
  404  Not Found [IP: 2001:67c:1560:8008::19 80]
Reading package lists...
E: The repository 'http://ppa.launchpad.net/webupd8team/ind...ect/ubuntu ./ Release' does not have a Release file.
W: GPG error: https://archive.linux.duke.edu/cran/bin/...nic-cran35 ./ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9
E: The repository 'https://archive.linux.duke.edu/cran/bin/...nic-cran35 ./ InRelease' is not signed.
E: The repository 'http://ppa.launchpad.net/webupd8team/ind...ect/ubuntu focal Release' does not have a Release file.
W: Target Packages (Packages) is configured multiple times in /etc/apt/sources.list.d/additional-repositories.list:2 and /etc/apt/sources.list.d/additional-repositories.list:3
W: Target Translations (en_IN) is configured multiple times in /etc/apt/sources.list.d/additional-repositories.list:2 and /etc/apt/sources.list.d/additional-repositories.list:3
W: Target Translations (en) is configured multiple times in /etc/apt/sources.list.d/additional-repositories.list:2 and /etc/apt/sources.list.d/additional-repositories.list:3

The PPA for indicator-kdeconnect is not currently being maintained.  You should really remove this software and the PPA.

https://www.linuxliteos.com/manual/software.html#pparem

At the minimum you will need to remove the PPA from your list of software sources to allow other software updates to progress.

Then try again.

I cannot able to remove PPA because unable to open software & updates
Please help!!

Do you mean it doesn't open or you can't find it ?

To find it, these methods should work.
Click Menu -> Settings
Scroll down the list to 'Software & Updates' and click on it.
OR
Click Menu, then in the search box begin typing the word 'software' - as you type there should be a pop up list in which 'Software & Updates' should appear which you can click on.

If you are clicking 'Software & Updates' and it doesn't open you need explain what happens.