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On Ubuntu 2012.04 I open "Connect to Hidden Wireless Network", type the network name, click connect. After a minute the dialog below appears:

enter image description here

I can only cancel... not very helpful.
Why does the dialog not just offer me to type the password?

On Ubuntu 2011.04 I am asked for a password and it just works...

The network is WPA2 Personal, but this other issue means I have to select "None" for security.

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This may help you: – Basharat Sialvi May 29 '12 at 6:46
Are there any unrecognized special characters (e.g. _´äöü8) in your key? – Takkat May 29 '12 at 6:51
@BasharatSial: I have no keyring problem. – Nicolas Raoul May 29 '12 at 8:32
@Takkat: the SSID contains only letters and underscores. The password only contains numbers. – Nicolas Raoul May 29 '12 at 8:34
Are you using TKIP or AES with WPA2? – izx May 29 '12 at 13:39
up vote 1 down vote accepted

Solved by reinstalling 12.04, this time it works...

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