This bug was fixed in the package libvirt - 1.2.12-0ubuntu12
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libvirt (1.2.12-0ubuntu12) vivid; urgency=low
* Add profile script to automatically set the default URI based on
the currently running hyperisor (Xen or KVM/Qemu).
(LP: #1334749)
-- Stefan BaderTue, 14 Apr
Stefan, did you ever reach any conclusions about this?
** Also affects: virtinst (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: virtinst (Ubuntu)
** Changed in: libvirt (Ubuntu)
Status: New => Incomplete
** Changed in: libvirt (Ubuntu)
Importance: Undecided