these kind of issues are usually driver bugs. please check latest kernel
packages from http://kernel.ubuntu.com/~kernel-ppa/mainline/
If the problem persists, attach outpuf of lspci -vv lsusb and your
complete syslog after reproducing.
** Package changed: network-manager (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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NetworkManager can't connect to wireless ap with wpa
https://bugs.launchpad.net/bugs/338680
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