Public bug reported:

Ever since I updated our two computers recently (1.9.2007) with the
usual security updates, wireless is broken. Both computers are running
Kubuntu Feisty Fawn and feature a Ralink RT 2500 wireless PCI card.

I have also tried to manually bring up the network as follows:

sudo iwconfig ra0 essid myessid
sudo dhclient ra0

with following result:

Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/ra0/00:10:41:a7:a0:3a
Sending on   LPF/ra0/00:10:41:a7:a0:3a
Sending on   Socket/fallback
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 15
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 2
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

Both computers were capable to use the Ralink wireless cards, although
not in combination with the KNetworkManager. I had to add following
parameters in the /etc/network/interfaces files in order to make the
Ralink wireless cards work:

iface ra0 inet dhcp
wireless-essid myessid
auto ra0

Note that my wireless network is running fine, as I use it currently to
write this message from a laptop that runs also Feisty Fawn, but
features another wireless card (not Ralink based).

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
Wireless broken by recent update (1.9.2007)
https://bugs.launchpad.net/bugs/136860
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