Comment 1 for bug 213805

Thank you for taking the time to report this bug and help make Ubuntu better. I can confirm the beep in update-manager on Hardy, using the steps you provided above. However, the tab focus changes correctly for me, so that might be a separate issue.

The beep only occurs the first time I change tab focus. Subsequent changes of tab focus result in no more beeps, until I close and then re-open update-manager.

Note that you can disable system beeps in Hardy by going to System -> Preferences -> Sound and selecting the 'System Beep' tab.

chr1s@chris-desktop:~$ apt-cache policy update-manager
update-manager:
  Installed: 1:0.87.30
  Candidate: 1:0.87.30
  Version table:
 *** 1:0.87.30 0
        500 http://archive.ubuntu.com hardy-updates/main Packages
        100 /var/lib/dpkg/status
     1:0.87.24 0
        500 http://archive.ubuntu.com hardy/main Packages
chr1s@chris-desktop:~$ lsb_release -rd
Description: Ubuntu 8.04.1
Release: 8.04