Hello Oliver, could you please run the following? ls -l /etc/ssl/certs/ISRG_Root_X1.pem /usr/share/ca- certificates/mozilla/ISRG_Root_X1.crt
(The first file should be a symbolic link to the second file.) I find the version on my system is identical to the version on the letsencrypt website, with a bit of mangling: sarnold@hunt:/tmp$ tr -d '\r' < isrgrootx1.pem.txt | sha256sum 22b557a27055b33606b6559f37703928d3e4ad79f110b407d04986e1843543d1 - sarnold@hunt:/tmp$ tr -d '\r' < /etc/ssl/certs/ISRG_Root_X1.pem | sha256sum 22b557a27055b33606b6559f37703928d3e4ad79f110b407d04986e1843543d1 - Thanks ** Changed in: ca-certificates (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ca-certificates in Ubuntu. https://bugs.launchpad.net/bugs/1808493 Title: Let's Encrypt CA Root Certificates missing Status in ca-certificates package in Ubuntu: Incomplete Bug description: Please add the Chain of trust for the Let's Encrypt CA to the ubuntu ca-certificates https://letsencrypt.org/certificates/ we have to add them always manually and i think it's time to accept, that let's encrypt is now one of the bigger CA. Missing in releases 16.04 LTS / 18.04 LTS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ca-certificates/+bug/1808493/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp