<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body bgcolor="#FFFFFF" text="#333333"> I found this solution, which worked for me. Forgot to record the exact source, so cannot provide a link nor attribute the original poster. Sorry. Only copied the text instructions on what needs to be done. <blockquote type="cite">Solution to Lightning on Thunderbird 60: On this link you will see that Thunderbird 60 requires Lightning version 6.2. r/<a class="moz-txt-link-freetext" href="https://developer.mozilla.org/en-US/docs/Mozilla/Calendar/Calendar_Versions">https://developer.mozilla.org/en-US/docs/Mozilla/Calendar/Calendar_Versions</a> You can download this version from Mozilla here: r/<a class="moz-txt-link-freetext" href="https://ftp.mozilla.org/pub/calendar/lightning/candidates/">https://ftp.mozilla.org/pub/calendar/lightning/candidates/</a> I used version "Dir 6.2b6-candidates/" at bottom of page. Download the .xpi file for you OS (Win, Mac or Linux). Install via the "Install Add-On from file" from the drop-down menu on the Firefox>Addons>Extensions page. Works normally. No problems.</blockquote> Hope that helps. Did the trick for me. All calendar data appeared again. Klaus <div class="moz-signature"> <title>email signature Klaus Maas</title> <hr align="center" width="100%" size="1"> </div> <div class="moz-cite-prefix">On 29/10/2018 11.06, Dr. Heiko Pollmeier wrote: </div> <blockquote type="cite" cite="mid:56c78a63-7076-af2c-82a6-5683b738fd11@t-online.de"> <pre class="moz-quote-pre" wrap="">Gruß zuvor / Greetings first! After I upgraded xubuntu from 16.04 LTS to 18.04 LTS there was automatically also a new Version of thunderbird (60.2) installed. With this new version of thunderbird the calendar extension lightning doesnt work anymore. How can I go back to version 59.2 , where lightning does work? Mit freundlichen Grüßen / With kind regards -- <sb> Dr. Heiko Pollmeier , Bonn <a class="moz-txt-link-rfc2396E" href="mailto:pollmeier-h@t-online.de"><pollmeier-h@t-online.de></a> Bevorzugter PGP-Schlüssel / Preferred PGP key ID 0x09E0BEF8 Schl.-Fingerabdruck = D325 0EAE 1947 7331 DC8C 4273 3C30 2B39 09E0 BEF8 <sb> %t </pre> </blockquote> </body> </html>