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<p>Hello, I am using Linux Mint 20.2 Uma 64-bit with Mate desktop on
my computer. Today I updated the machine in terminal as superuser
by passing the following command <b>apt-get update &&
apt-get upgrade </b>. <br>
</p>
<p>1. I received the following invalid signature key message output
as follows:<br>
</p>
Ign:1 <a class="moz-txt-link-freetext" href="http://packages.linuxmint.com">http://packages.linuxmint.com</a> uma InRelease<br>
Hit:2 <a class="moz-txt-link-freetext" href="http://packages.linuxmint.com">http://packages.linuxmint.com</a> uma
Release <br>
Hit:3 <a class="moz-txt-link-freetext" href="http://security.ubuntu.com/ubuntu">http://security.ubuntu.com/ubuntu</a> focal-security
InRelease <br>
Hit:4 <a class="moz-txt-link-freetext" href="http://archive.ubuntu.com/ubuntu">http://archive.ubuntu.com/ubuntu</a> focal
InRelease <br>
Hit:5 <a class="moz-txt-link-freetext" href="http://archive.canonical.com/ubuntu">http://archive.canonical.com/ubuntu</a> focal
InRelease <br>
Hit:6 <a class="moz-txt-link-freetext" href="http://ppa.launchpad.net/sane-project/sane-release/ubuntu">http://ppa.launchpad.net/sane-project/sane-release/ubuntu</a>
focal InRelease<br>
Hit:7 <a class="moz-txt-link-freetext" href="https://repo.skype.com/deb">https://repo.skype.com/deb</a> stable
InRelease <br>
Hit:8 <a class="moz-txt-link-freetext" href="http://archive.ubuntu.com/ubuntu">http://archive.ubuntu.com/ubuntu</a> focal-updates
InRelease <br>
Hit:10 <a class="moz-txt-link-freetext" href="http://archive.ubuntu.com/ubuntu">http://archive.ubuntu.com/ubuntu</a> focal-backports InRelease<br>
Get:11
<a class="moz-txt-link-freetext" href="http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04">http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04</a>
InRelease [1,509 B]<br>
Err:11
<a class="moz-txt-link-freetext" href="http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04">http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04</a>
InRelease<br>
The following signatures were invalid: EXPKEYSIG 23E07629B9E3C9E4
home:pzz OBS Project <a class="moz-txt-link-rfc2396E" href="mailto:home:pzz@build.opensuse.org"><home:pzz@build.opensuse.org></a><br>
Reading package lists... Done<br>
W: GPG error:
<a class="moz-txt-link-freetext" href="http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04">http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04</a>
InRelease: The following signatures were invalid: EXPKEYSIG
23E07629B9E3C9E4 home:pzz OBS Project
<a class="moz-txt-link-rfc2396E" href="mailto:home:pzz@build.opensuse.org"><home:pzz@build.opensuse.org></a><br>
E: The repository
'<a class="moz-txt-link-freetext" href="http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04">http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04</a>
InRelease' is not signed.<br>
N: Updating from such a repository can't be done securely, and is
therefore disabled by default.<br>
N: See apt-secure(8) manpage for repository creation and user
configuration details.<br>
<p><br>
</p>
<p>2. I am using the openSUSE build service to aquire a prebuilt
binary package of sane-airscan and have the following sources
entry added in Update Manager -> Software Sources -> deb
<a class="moz-txt-link-freetext" href="http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04/">http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04/</a>
/</p>
<p>3. I typically update the desktop here every few days and have
had no signature issues for quite some time.</p>
<p>4. I did attempt the following by using GUI: Update Manager ->
Software Sources -> Maintenance -> Add missing keys <br>
</p>
<p>5. I then attempted to once again update APT cache within update
manager (not bash terminal this time) with the following error
output: <b>Failed to download repository information </b>the
following dialog is shown below this message -> W:GPG error:
<a class="moz-txt-link-freetext" href="http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04">http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04</a>
InRelease: The following signatures were invalid: EXPKEYSIG
23E07629B9E3C9E4 home:pzz OBS Project
<a class="moz-txt-link-rfc2396E" href="mailto:home:pzz@build.opensuse.org"><home:pzz@build.opensuse.org></a>, E:The repository
'<a class="moz-txt-link-freetext" href="http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04">http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04</a>
InRelease' is not signed.</p>
<p>I am wondering of what is the best step to proceed with this
matter? I understand that I could possibly disable the repository
quite easily in update manager. Then I would no longer receive
updates for sane-airscan though. I thank you for help with this if
able.</p>
<p>-Best Wishes<br>
</p>
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