I cannot reproduce this on up-to-date dapper.
Can you attach your /etc/network/interfaces file? And output of "ifconfig"
before you go in administrator mode.
Is this for wired or wireless interface?
** Changed in: kdeadmin knetworkconf (Ubuntu)
Status: Confirmed => Needs Info
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[Dapper] Application Crash when trying to configure network interface thats not
enabled
https://launchpad.net/bugs/30775
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