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I recently tried to update my printer files, which didn't work and now the update keeps looking for these and comes up with an error. How can I get my update to forget about printer files and work normally again please. Copy of error log below
============ Log ===========

Hit:1 http://archive.canonical.com xenial InRelease
Get:2 http://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB]
Ign:3 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial InRelease
Hit:4 http://ppa.launchpad.net/nemh/systemback/ubuntu xenial InRelease
Hit:5 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu xenial InRelease
Hit:6 http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu xenial InRelease
Hit:7 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Ign:8 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial Release
Ign:9 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main amd64 Packages
Get:10 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]
Ign:11 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main i386 Packages
Ign:12 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main all Packages
Ign:13 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en_US
Ign:14 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en
Ign:9 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main amd64 Packages
Ign:11 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main i386 Packages
Ign:12 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main all Packages
Ign:13 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en_US
Ign:14 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en
Ign:9 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main amd64 Packages
Get:15 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]
Ign:11 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main i386 Packages
Ign:12 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main all Packages
Ign:13 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en_US
Ign:14 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en
Ign:9 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main amd64 Packages
Get:16 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [990 kB]
Ign:11 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main i386 Packages
Ign:12 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main all Packages
Ign:13 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en_US
Ign:14 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en
Ign:9 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main amd64 Packages
Ign:11 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main i386 Packages
Ign:12 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main all Packages
Ign:13 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en_US
Ign:14 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en
Err:9 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main amd64 Packages
  404  Not Found
Get:17 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages [841 kB]
Ign:11 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main i386 Packages
Ign:12 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main all Packages
Get:18 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [756 kB]
Ign:13 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en_US
Get:19 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [691 kB]
Ign:14 http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial/main Translation-en
Hit:20 http://repo.linuxliteos.com/linuxlite citrine InRelease
Fetched 3,602 kB in 2s (1,658 kB/s)
Reading package lists...
W: The repository 'http://ppa.launchpad.net/hplip-isv/ppa/ubuntu xenial Release' does not have a Release file.
E: Failed to fetch http://ppa.launchpad.net/hplip-isv/ppa/u...4/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

Remove the HP PPA, that is the problem, you don't need it.

Thanks, all fixed now and working well again.