It seems not to exist for 64bit version on the official website it talks just a x86 version
http://www.mozilla.org/projects/calendar/lightning/ -- Lucid - Adding Lightning from the repos does nothing https://bugs.launchpad.net/bugs/549362 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
