Comment 18 for bug 316222

Okay, this is what I have:
apt-cache policy xfce4-session
xfce4-session:
  Installed: 4.4.3-0ubuntu3
  Candidate: 4.5.99.1-0ubuntu1
  Version table:
     4.5.99.1-0ubuntu1 0
        500 http://us.archive.ubuntu.com jaunty/universe Packages
 *** 4.4.3-0ubuntu3 0
        100 /var/lib/dpkg/status

This is what you have:
xfce4-session:
已安裝:4.4.3-0ubuntu1~intrepid1
  候選:4.5.99.1-0ubuntu1
  版本表格:
     4.5.99.1-0ubuntu1 0
        500 http://tw.archive.ubuntu.com jaunty/universe Packages
 *** 4.4.3-0ubuntu1~intrepid1 0
        100 /var/lib/dpkg/status

Please note that I do not have 已安裝:4.4.3-0ubuntu1~intrepid1 . This is an error in you sources.list. You are installing or need to remove intrepid components. Please check your /etc/apt/sources for lines with intrepid in them. They need to be changed to jaunty. Then run "sudo apt-get update" and "sudo apt-get dist-upgrade" to attempt to fix this.