Further to #4, #5: enigmail 1.0.1 as installed via apt is broken, enigmail 1.0.1 downloaded from Mozilla is OK, so it's an Ubuntu problem. b.t.w no need to uninstall the Ubuntu version, just disable it in add-ons before installing the official Mozilla one.
Further to #4, #5: enigmail 1.0.1 as installed via apt is broken, enigmail 1.0.1 downloaded from Mozilla is OK, so it's an Ubuntu problem. b.t.w no need to uninstall the Ubuntu version, just disable it in add-ons before installing the official Mozilla one.