Thank you for your bug. This upload fixes it:
gdm (2.18.0-0ubuntu4) feisty; urgency=low
.
* debian/control:
- Recommends ubuntu-sounds rather than Depends on it (Ubuntu: #97197)
** Changed in: gdm (Ubuntu)
Importance: Medium => Wishlist
Status: Confirmed => Fix Released
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GDM depends on ubuntu-sounds
https://launchpad.net/bugs/97197