Please see the following bugs about what you are seeing.
https://bugs.launchpad.net/ubuntu/+source/stumbleupon/+bug/571134
and
https://bugs.launchpad.net/ubuntu/+source/lightning-sunbird/+bug/532232
** Changed in: lightning-sunbird (Ubuntu)
Status: New => Won't Fix
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Sunbird removed from Lucid, but lightning plugin missing
https://bugs.launchpad.net/bugs/571829
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