Also affects ubuntu 11.10.

Here's what was happening: my wifi interface was showing up as up but unmanaged 
(this
is a very fresh installation, so that's how the installer left it), and 'route' 
showed

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.0.1     0.0.0.0         UG    0      0        0 eth0
default         192.168.0.1     0.0.0.0         UG    100    0        0 wlan0
link-local      *               255.255.0.0     U     1000   0        0 eth0
192.168.0.0     *               255.255.255.0   U     0      0        0 wlan0
192.168.0.0     *               255.255.255.0   U     1      0        0 eth0

The command 'ifconfig wlan0 down' fixed the problem!  After that, the
routing table was

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0
192.168.0.0     0.0.0.0         255.255.255.0   U     1      0        0 eth0

and everything was hunky-dory.

So the problem was that the installer left my system in an inconsistent
state: wlan0 was up but not managed, and acted as a packet /dev/null 
35 seconds out of every 43 seconds.

** Package changed: ubuntu => network-manager (Ubuntu)

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https://bugs.launchpad.net/bugs/917399

Title:
  Ubuntu 12.04 alpha 1 network flaky after update

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