I can confirm this on jaunty. After signing up for ubuntuone, the repository that's enabled is https, and apt-file gives this error:
$ sudo apt-file update W: Don't know how to handle https: Bad file descriptor This wasn't present before adding the https repository. -- Doesn't know how to handle https https://bugs.launchpad.net/bugs/331091 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs