Server issue on Ubuntu 20 (crashes more or less immediately)

[fttx]

Indeed what happens is that there is an (empty) tray icon still around for maybe 20 seconds or so after the last main window disappears, but that then disappears by itself. The "barcode-to-pc-server.v4.3.1.linux.x86_64.AppImage" program I've launched from the command line does not close though, but around the time when the main window disappears, shows this message:

Checking for update
Checking for update...
Update for version 4.3.1 is not available (latest version: 4.3.1, downgrade is disallowed).
Update not available.
Autoupdater: {
  versionInfo: {
    tag: 'v4.3.1',
    version: '4.3.1',
    files: [ [Object] ],
    path: 'barcode-to-pc-server.v4.3.1.linux.x86_64.AppImage',
    sha512: 'KkzAboWTq+SPhDlUAI9z6Pb/f/HGLxWGa+KyIYRXrKdQEJ7CY8ENxPcWWs8PvnjxlR6F9c8AWqRZs7rwK8/+uw==',
    releaseDate: '2022-11-06T08:32:35.188Z',
    releaseName: 'v4.3.1',
    releaseNotes: '<h3>Added</h3>\n' +
      '<ul>\n' +
      '<li>Append option for the GOOGLE_SHEETS component</li>\n' +
      '<li>Google Sheet integration</li>\n' +
      '<li>NFC tags scanning support</li>\n' +
      '<li>Option to execute components after offline scannings</li>\n' +
      '</ul>\n' +
      '<h3>Changed</h3>\n' +
      '<ul>\n' +
      '<li>Minor UX improvements</li>\n' +
      '</ul>\n' +
      '<h3>Fixed</h3>\n' +
      '<ul>\n' +
      '<li>Connections issues on iOS</li>\n' +
      '<li>Minimization option on macOS Ventura (server side)</li>\n' +
      '</ul>'
  },
  updateInfo: {
    tag: 'v4.3.1',
    version: '4.3.1',
    files: [ [Object] ],
    path: 'barcode-to-pc-server.v4.3.1.linux.x86_64.AppImage',
    sha512: 'KkzAboWTq+SPhDlUAI9z6Pb/f/HGLxWGa+KyIYRXrKdQEJ7CY8ENxPcWWs8PvnjxlR6F9c8AWqRZs7rwK8/+uw==',
    releaseDate: '2022-11-06T08:32:35.188Z',
    releaseName: 'v4.3.1',
    releaseNotes: '<h3>Added</h3>\n' +
      '<ul>\n' +
      '<li>Append option for the GOOGLE_SHEETS component</li>\n' +
      '<li>Google Sheet integration</li>\n' +
      '<li>NFC tags scanning support</li>\n' +
      '<li>Option to execute components after offline scannings</li>\n' +
      '</ul>\n' +
      '<h3>Changed</h3>\n' +
      '<ul>\n' +
      '<li>Minor UX improvements</li>\n' +
      '</ul>\n' +
      '<h3>Fixed</h3>\n' +
      '<ul>\n' +
      '<li>Connections issues on iOS</li>\n' +
      '<li>Minimization option on macOS Ventura (server side)</li>\n' +
      '</ul>'
  }
}
In the beginning it also shows this:

libva error: vaGetDriverNameByIndex() failed with unknown libva error, driver_name = (null)
[302928:1205/121354.182681:ERROR:sandbox_linux.cc(374)] InitializeSandbox() called with multiple threads in process gpu-process.
node_mdns error, faillback to bonjour
In the syslog I find this message:
gnome-shell[1732]: Window manager warning: Invalid WM_TRANSIENT_FOR window 0x2c00002 specified for 0x2e0000c.