[SOLVED] An error occurred during the signature verification.

[joneall]

I can't do an apt update without errors anymore.

$ sudo apt  update    
...
Building dependency tree       
Reading state information... Done
All packages are up to date.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.ubuntu.com/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32 NO_PUBKEY 871920D1991BC93C

and more of the same errors. Could this be because of my having delted all the *.gpg files in /etc/apt/trusted.gpg.d in an effort to correct another problem?

Btw, I can't for the life of me figure out how to use Discover to do this. The online info is out of date and I can not find any software update tab on mine. I'm at Plasma version 5.20.4.

[Snowhog]

See https://www.kubuntuforums.net/showth...ight=NO_PUBKEY

You have to replace the key with the key(s) that apt is telling you about. In your specific case, you'll run the command twice:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 871920D1991BC93C

[joneall]

You have to replace the key with the key(s) that apt is telling you about. In your specific case, you'll run the command twice:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 871920D1991BC93C

It's better now, but I still get the msg for NO_PUBKEY E6D4736255751E5D. I presume I should pass the same command for that key.

Yup, that did it. I'm not sure what these keys are for. Thanks a lot.

[claydoh]

Those GPG keys are what apt uses to verify that the repositories are legitimate, and are what they say they are.

They have zero connection to the skype keyring problem you have/had. btw.

[jlittle]

Btw, I can't for the life of me figure out how to use Discover to do this.

Discover is mostly just a front end to APT, as is the apt command, synaptic, muon, and so on. If APT is broken changing the front end won't help, mostly.

[Snowhog]

Btw, I can't for the life of me figure out how to use Discover to do this. The online info is out of date and I can not find any software update tab on mine. I'm at Plasma version 5.20.4.

With Discover running, click on Settings (bottom left) and then in the window on the right, click on Software Sources. You'll be prompted for password. Once verified, a new window will open (Software Sources). All the Tabs one is used to seeing are there.