Thanks for taking the time to report this bug. 11.10 reached EOL on May 9, 2013.
Please see this document for currently supported Kubuntu releases:
https://wiki.kubuntu.org/Releases
Unfortunately this means that there will be no more bugfixes for 11.10.
It is also recommended that you upgrade, if
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: kde-workspace (Ubuntu)
Status: New => Confirmed
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Bugs, which is subscribed to kde-workspace in Ubuntu.
https://bugs.launchpad.net/bugs/881377
Title:
Panel missing after second monitor unplugged
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