ubuntu源里的thunderbird还是2.*的，3.*已经出了好久了 参考[这里](http://www.ubuntu- inside.me/2009/08/howto-install-thunderbird-3-beta-on.html) sources.list中添加个ppa的源 sudo gedit /etc/apt/sources.list
deb http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu jaunty main
添加key
$sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 247510BE
$sudo apt-get update
$sudo apt-get install thunderbird-3.0 thunderbird-3.0-gnome-support