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When I try to update using apt-get update I get the following errors (which are incresing in amount while I'm following some tutos found here).

W: GPG error: http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04  Release: The following signatures were invalid: EXPKEYSIG 5A7D1D38BEB6D886 home:Horst3180 OBS Project <home:[email protected]>
E: The repository 'http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04  Release' is not signed.
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: Target Packages (Packages) is configured multiple times in /etc/apt/sources.list.d/arc-theme.list:1 and /etc/apt/sources.list.d/home:Horst3180.list:1
W: Target Translations (en_US) is configured multiple times in /etc/apt/sources.list.d/arc-theme.list:1 and /etc/apt/sources.list.d/home:Horst3180.list:1
W: Target Translations (en) is configured multiple times in /etc/apt/sources.list.d/arc-theme.list:1 and /etc/apt/sources.list.d/home:Horst3180.list:1

This Solution gave me the last three Ws in the above list and I also tried to update the expired signatures (where I did not succed).

This is what I get when I run cat /etc/apt/sources.list.

# deb cdrom:[Ubuntu 18.04.3 LTS _Bionic Beaver_ - Release amd64 (20190805)]/ bionic main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://es.archive.ubuntu.com/ubuntu/ bionic main restricted
# deb-src http://es.archive.ubuntu.com/ubuntu/ bionic main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://es.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
# deb-src http://es.archive.ubuntu.com/ubuntu/ bionic-updates main restricted

## N.B. 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.
deb http://es.archive.ubuntu.com/ubuntu/ bionic universe
# deb-src http://es.archive.ubuntu.com/ubuntu/ bionic universe
deb http://es.archive.ubuntu.com/ubuntu/ bionic-updates universe
# deb-src http://es.archive.ubuntu.com/ubuntu/ bionic-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## 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.
deb http://es.archive.ubuntu.com/ubuntu/ bionic multiverse
# deb-src http://es.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://es.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
# deb-src http://es.archive.ubuntu.com/ubuntu/ bionic-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that 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://es.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src http://es.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu bionic partner
# deb-src http://archive.canonical.com/ubuntu bionic partner

deb http://security.ubuntu.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://security.ubuntu.com/ubuntu bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://security.ubuntu.com/ubuntu bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse
deb http://archive.canonical.com/ precise partner
# deb-src http://archive.canonical.com/ precise partner

I have the following files in /etc/apt/sources.list.d.

arc-theme.list           home:Horst3180.list
arc-theme.list.save      home:Horst3180.list.save
google-chrome.list       sunderme-ubuntu-texstudio-bionic.list
google-chrome.list.save  sunderme-ubuntu-texstudio-bionic.list.save
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  • Does this answer your question? Ubuntu gives error while update
    – N0rbert
    May 24, 2020 at 16:12
  • @N0rbert The link in my question is exactly what you are asking me to try. After doing that I've got the last three errors.
    – Lecter
    May 24, 2020 at 16:50
  • 1
    There's a problem with your /etc/apt/sources.list or an issue with that PPA. That's what the errors are saying. Please edit your question with the output of cat /etc/apt/sources.list. Are you still using the software associated with that PPA?
    – Nmath
    May 24, 2020 at 17:18
  • 1
    that PPA isn't in the default location, but it's that "Horst3180" PPA that is causing problems. Do you have files in the folder /etc/apt/sources.list.d/? (FYI PPA is a pretty insecure way of installing software, I would never recommend adding a PPA for a theme) See also: askubuntu.com/questions/307/how-can-ppas-be-removed
    – Nmath
    May 24, 2020 at 17:41
  • 2
    I suggest the solutions on the question on "How can PPAs be removed". Removing those PPAs from your sources should resolve the issue. As a last resort you can copy the files under /etc/apt/sources.list.d/ as a backup, and then delete them, then try to run sudo apt update again. If removing those files breaks something you can restore them/ move them back.
    – Nmath
    May 24, 2020 at 18:03

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