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        fingerprint = (self.logger.npts,
        self.soft_limits(),
        s.actual_position,
        s.motion_mode,
        s.current_vel,
        s.joint_actual_position,
        s.homed,
        s.limit,    
        s.tool_in_spindle,             
        s.g5x_offset,
        s.g92_offset,
        s.rotation_xy,
        s.tool_offset)

        if fingerprint[9:12] != self.fingerprint[9:12] or s.file != self._current_file:
            if self.display_loaded:
                self.load()

        if fingerprint != self.fingerprint:
            self.fingerprint = fingerprint            
            self.update()

Get:7 http://download.opensuse.org/repositories/science:/EtherLab/Debian_12 ./ InRelease [1,575 B]
Hit:8 https://www.linuxcnc.org bookworm InRelease                        
Err:7 http://download.opensuse.org/repositories/science:/EtherLab/Debian_12 ./ InRelease
  The following signatures were invalid: EXPKEYSIG A94819A7CB97A204 science:EtherLab OBS Project <science:EtherLab@build.opensuse.org>
Fetched 1,575 B in 3s (564 B/s)
Reading package lists... Done
Building dependency tree... Done
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://download.opensuse.org/repositories/science:/EtherLab/Debian_12 ./ InRelease: The following signatures were invalid: EXPKEYSIG A94819A7CB97A204 science:EtherLab OBS Project <science:EtherLab@build.opensuse.org>
W: Failed to fetch http://download.opensuse.org/repositories/science:/EtherLab/Debian_12/./InRelease  The following signatures were invalid: EXPKEYSIG A94819A7CB97A204 science:EtherLab OBS Project <science:EtherLab@build.opensuse.org>
W: Some index files failed to download. They have been ignored, or old ones used instead.

1. Downloaded the latest `science_EtherLab_key.gpg` to `~/Downloads`
2. cd there, then `gpg --dearmor science_EtherLab_key.gpg`, which created a `science_EtherLab_key.gpg.gpg` file.
3. `su` to temporarly be root, do `cp science_EtherLab_key.gpg.gpg /usr/share/keyrings/etherlab-archive-keyring.gpg` which copies the file into the appropriate system folder.
4. `exit` to quit root.  Try `sudo apt update` again: nope, keysig still invalid.