[Trisquel-users] Re : How connect to Nextcloud Calendar & Contacts with Icedove?

[lcerf]

Lighting is in the default install (the related package is  
"xul-ext-lightning").  You can download  
https://addons.thunderbird.net/thunderbird/downloads/latest/cardbook/addon-634298-latest.xpi  
and install this file from the "gear" menu in the window listing the  
installed extension (accessible from the burger menu).