Public bug reported:
My wireless adapter fails to connect after applying updates this
morning. Network manager associates with the network correctly, but
fails to receive an ip address. Investigating from the terminal, I can
manually assign a network address and then connect to the network, but
running "sudo dhclient wlan0" fails with an error:
Open a socket for LPF: Operation not permitted.
Disabling apparmor via "sudo /etc/init.d/apparmor stop" makes things
work properly again.
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: Confirmed
** Affects: dhcp3 (Ubuntu)
Importance: Undecided
Status: New
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[karmic] dhcp fails with wireless link under 2.6.31-5-generic #24
https://bugs.launchpad.net/bugs/408779
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