It seems that this problem is actually caused by wireless-tools version 28 that 
supports Wireless Extension up to version 20, but ubuntu kernel and wireless 
drivers are compiled with Wireless Extension v21, which will be completely 
supported only from the next wireless-tools - v29.
I tried previous K(Ubuntu) versions and everything worked correctly, but 
iwconfig --version showed that there was no mismatch between Wireless 
Extensions version and Wireless tools version. (See also bug #91009)

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can't connect to hidden network
https://bugs.launchpad.net/bugs/50214
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