I'm currently on 10.10 and no longer experiencing this issue. Thanks for
the follow up.
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https://bugs.launchpad.net/bugs/612829
Title:
Switching users freezes workstation temporarily
Thanks for the report, it has been some time without any response or
feedback in this bug report and we are wondering if this is still an
issue for you with the latest release of Ubuntu the Natty Narwhal, May
you please test with that version and comment back if you're still
having or not the issue
