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I tried to update & while fetching packages it is showing the error below-


[color=blue][b][b]===========================
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 ===========

Hit:1 http://archive.canonical.com xenial InRelease
Ign:2 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:4 http://repo.linuxliteos.com/linuxlite citrine InRelease
Hit:5 http://ppa.launchpad.net/nemh/systemback/ubuntu xenial InRelease
Get:6 http://us.archive.ubuntu.com/ubuntu xenial-security InRelease [109 kB]
Hit:7 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial InRelease
Hit:8 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu xenial InRelease
Get:9 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]
Hit:10 http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu xenial InRelease
Get:11 http://us.archive.ubuntu.com/ubuntu xenial-proposed InRelease [260 kB]
Get:12 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]
Get:13 http://us.archive.ubuntu.com/ubuntu xenial-security/main i386 Packages [647 kB]
Get:14 http://us.archive.ubuntu.com/ubuntu xenial-security/universe i386 Packages [420 kB]
Get:15 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages [907 kB]
Get:16 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [718 kB]
Get:17 http://us.archive.ubuntu.com/ubuntu xenial-proposed/main i386 Packages [44.2 kB]
Get:18 http://us.archive.ubuntu.com/ubuntu xenial-proposed/main Translation-en [26.0 kB]
Ign:19 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial Release
Ign:20 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en
Ign:20 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en
Ign:20 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en
Ign:20 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en
Ign:20 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en
Err:20 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main i386 Packages
  404  Not Found [IP: 91.189.95.83 80]
Ign:21 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial/main Translation-en
Fetched 3,347 kB in 2min 32s (22.0 kB/s)
Reading package lists...
W: The repository 'http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu xenial Release' does not have a Release file.
E: Failed to fetch http://ppa.launchpad.net/cairo-dock-team...6/Packages  404  Not Found [IP: 91.189.95.83 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.


Should I remove Cairo dock or is ther any other way?

Well its telling you the issue




That URL doesn't exist so you can't..


Can confirm looking at the URL http://ppa.launchpad.net/cairo-dock-team...ntu/dists/
There is not a Xenial option, which is Ubuntu 16.04 the base for LL3.8


The fix, remove the PPA and update again... (you'll find w/ PPA's this a norm)


Do you have other options, sure you can reach out to the Cairo Dev's to see if there options, or if they plan to update...


Some good info regarding PPA's: https://www.linuxliteos.com/manual/softw...type=0#ppa

Thanks Mahn. Worked like a charm!