I also thought originally that this is a network-manager issue, but it's
actually gnome-keyring who's at fault here. gnome-keyring and libgnome-
keyring0 were recently upgraded in gutsy to 2.19.4.1 from 0.8.1. The
latest network-manager from gutsy works great with the old version, but
breaks down completely for me with the new one. Even when I applied a
workaround mentioned here, wireless connections only lasted a few
seconds before breaking up, and network-manager was segfaulting
constantly.

So, I went to packages.ubuntu.org, downloaded libgnome-keyring0 and
gnome-keyring for feisty, and downgraded them. Everything is back to
normal now.

Some of the symptoms of network-manager 0.6.5's differences in
communication between keyring 0.8.1 and 2.19.4.1. When I login, I'm
normally prompted for my keyring password only. With the latest gutsy
version 2.19.4.1, I was instead prompted to "Deny, Allow once, Allow
always" for nm-applet. network-manager would then crash. It only
"worked" when I had keyring-manager application open at the same time,
and even then it would try to connect unsuccessfully for a long time or
connect and then crash or disconnect immediately. I'm using WPA2 PSK
(AES) with Atheros non-GPL driver (madwifi).

-- 
Segfault retrieving passphrase for WiFi network
https://bugs.launchpad.net/bugs/121228
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