zaphod-42 commented on issue #1872: Cannot update Debian stable release as its signed by an expired GPG key URL: https://github.com/apache/incubator-pagespeed-mod/issues/1872#issuecomment-486700223 I had this issue today as well and corrected it with the steps outlined here: https://support.plesk.com/hc/en-us/articles/360021566754--apt-update-is-not-working-on-Plesk-server-with-Ubuntu-or-Debian-after-installing-PageSpeed-Apache-module-through-Google-PageSpeed-Insights-extension-The-repository-http-dl-google-com-linux-mod-pagespeed-deb-stable-Release-is-not-signed
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