please attach your /etc/network/interfaces to this bug. Do you happen to use 'wpa-roam'? in this case, use 'wpa_action $IFACE stop' to bring down your interface.
** Changed in: wpasupplicant (Ubuntu)
Status: Unconfirmed => Needs Info
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ifupdown script fails to terminate wpasupplicant
https://launchpad.net/bugs/72152
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