This may be bug 183968.
Check the output of the command "ifconfig". If one of the entries in
that output is named wlan0_rename or similar, it's almost certainly that
bug and you can use the workaround listed at bug 183968. Please tell us
what happened either way.
** Changed in: network-manager (Ubuntu)
Status: New => Incomplete
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network manager fails to find wireless network after suspend
https://bugs.launchpad.net/bugs/211322
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