I also encountered this bug. It affects any program that passes attachments to Thunderbird (I hit it while using DarkTable 1.1 under Ubuntu 12.10 Quantal Quetzal). See attached patch for a simple fix.
Note that there is a newer version of xdg-utils included in Debian, but it contains other bugs. ** Patch added: "xdg-email.patch" https://bugs.launchpad.net/ubuntu/+source/xdg-utils/+bug/1019259/+attachment/3457022/+files/xdg-email.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1019259 Title: xdg-email fails to launch Thunderbird To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xdg-utils/+bug/1019259/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs