Article 5F97E The following signatures were invalid: EXPKEYSIG 0FAD31CA8719FCE4

The following signatures were invalid: EXPKEYSIG 0FAD31CA8719FCE4

by
masacra90
from LinuxQuestions.org on (#5F97E)
Hello all,

I am a new member around here and a recent Linux user - by all means a newbie, so forgive me if the following will seem like a silly issue to have.

Basically, for the last few days, I've received the following issue multiple times as a result of running apt-get update:

Reading package lists... Done
W: GPG error: http://download.opensuse.org/reposit...sser/Debian_10 InRelease: The following signatures were invalid: EXPKEYSIG 0FAD31CA8719FCE4 home:stevenpusser OBS Project <home:stevenpusser@build.opensuse.org>
E: The repository 'http://download.opensuse.org/repositories/home:/stevenpusser/Debian_10 InRelease' 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.

I have found a few posts which seem to get this issue resolved - but in most cases the OP's are running some version of Ubuntu rather than Debian stable (buster) as in my case.

I have tried the following (with various server addresses):

gpg --keyserver hkp://subkeys.pgp.net --recv-keys 0FAD31CA8719FCE4
gpg --export --armor 0FAD31CA8719FCE4 | sudo apt-key add -

But then I run into a different problem, namely:
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

So then I run

ps aux | grep -i apt

and I try to do sudo kill on whatever process id I find, but that also does not work.
Right at this moment, when I do that I have the following output:

masacra+ 18587 0.0 0.8 467404 65148 ? SNl 21:16 0:00 /usr/bin/python /usr/bin/apt-notifier.py
root 24549 0.0 0.0 70424 892 pts/1 S+ 21:29 0:00 grep -i apt

So I run

sudo kill 18587

which works fine, and

sudo kill 24549

which gives me

kill: (24549): No such process

and then I'm back to trying to run ps aux | grep -i apt which gives me a different PID from root

I thought I could just remove the file home:stevenpusser.gpg from /etc/apt/trusted.gpg.d/
but alas the "delete" option is greyed out.

And so I'm stuck in this loop where the /var/lib/dpkg/lock error prevents me from running apt-get update or installing the firejail package which I wanted to download to learn a bit more about sandboxing and run Ungoogled Chromium on my system.

My Distro: MX-19.3_x64 patito feo February 15 2020 base: Debian GNU/Linux 10 (buster)

Could the problem be that I am on the InRelease version of MX ?
Any suggestions most welcome.latest?d=yIl2AUoC8zA latest?i=O8pZL0TAjPM:Y87xCjP7UkU:F7zBnMy latest?i=O8pZL0TAjPM:Y87xCjP7UkU:V_sGLiP latest?d=qj6IDK7rITs latest?i=O8pZL0TAjPM:Y87xCjP7UkU:gIN9vFwO8pZL0TAjPM
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