[Solved] Update Manager Errors

[FrankN209]

Hello,

For the past two days, every time i try to use the update manager, i get this error. I can't find a solution for it.

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W: GPG error: http://download.opensuse.org/repositories/home:/stevenpusser/xUbuntu_17.04  Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0FAD31CA8719FCE4
W: The repository 'http://download.opensuse.org/repositories/home:/stevenpusser/xUbuntu_17.04  Release' is not signed.

[minitux]

it's a ppa for ubuntu 17.04 you should remove it

for now post this command line output

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inxi -Sr

[FrankN209]

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System:    Host: nuclinuxuser-desktop Kernel: 4.13.0-26-generic x86_64 (64 bit)
           Desktop: Cinnamon 3.6.7  Distro: Linux Mint 18.3 Sylvia
Repos:     Active apt sources in file: /etc/apt/sources.list.d/deluge-team-ppa-xenial.list
           deb http://ppa.launchpad.net/deluge-team/ppa/ubuntu xenial main
           deb-src http://ppa.launchpad.net/deluge-team/ppa/ubuntu xenial main
           Active apt sources in file: /etc/apt/sources.list.d/official-package-repositories.list
           deb http://packages.linuxmint.com sylvia main upstream import backport
           deb http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse
           deb http://archive.ubuntu.com/ubuntu xenial-updates main restricted universe multiverse
           deb http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse
           deb http://security.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse
           deb http://archive.canonical.com/ubuntu/ xenial partner
           Active apt sources in file: /etc/apt/sources.list.d/palemoon.list
           deb http://download.opensuse.org/repositories/home:/stevenpusser/xUbuntu_17.04/ /

[FrankN209]

I imported a new key, it seems to working fine now.

[minitux]

Oh, ok, I thought it was a ppa to simply install themes, but verifying, instead, is the ppa for the installation and maintenance of Palemoon browser.

However, it was written in the instructions (that you probably followed) here, to import the key, to receive updates and make the packages trusted for your system.
https://software.opensuse.org/download. ... e=palemoon

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wget -nv https://download.opensuse.org/repositories/home:stevenpusser/xUbuntu_17.04/Release.key -O Release.key

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sudo apt-key add - < Release.key

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sudo apt update

or
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com <PUBKEY>

In your case, is

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sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0FAD31CA8719FCE4 && sudo apt update