Err:1 http://download.opensuse.org/repositories/home:/ungoogled_chromium/Debian_Sid  InRelease
  The following signatures were invalid: EXPKEYSIG 02456C79B2FD48BF home:ungoogled_chromium OBS Project <home:ungoogled_chromium@build.opensuse.org>

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/home:/ungoogled_chromium/Debian_Sid  InRelease: The following signatures were invalid: EXPKEYSIG 02456C79B2FD48BF home:ungoogled_chromium OBS Project <home:ungoogled_chromium@build.opensuse.org>
W: Failed to fetch http://download.opensuse.org/repositories/home:/ungoogled_chromium/Debian_Sid/InRelease  The following signatures were invalid: EXPKEYSIG 02456C79B2FD48BF home:ungoogled_chromium OBS Project <home:ungoogled_chromium@build.opensuse.org>
W: Some index files failed to download. They have been ignored, or old ones used instead.