I'm having the exact same problem. When I installed the ATI restricted drivers, it broke the sound, as did upgrading the linux-restricted- modules.
Selecting the Open Sound System did not fix my problem. -- No sound after installing restricted driver https://bugs.launchpad.net/bugs/145324 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
