I gave you the link to the last version of Lightning that Icedove/Thunderbird 52.* (the version that Trisquel 8 ships) supports and. In that post: https://trisquel.info/forum/seek-alternative-lightning-calender-icedove#comment-141069

There are several ways to install the latest version of Thunderbird too. For instance using this PPA: https://launchpad.net/~mozillateam/+archive/ubuntu/ppa/

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