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[Dan Kegel <dank@xxxxxxxxx>]

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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Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/917399

Title:
  Ubuntu 12.04 alpha 1 network flaky after update

Status in “network-manager” package in Ubuntu:
  New

Bug description:
  Testing 12.04 alpha 1 64 bit on my Asus G60JX laptop.
  Worked well enough with previous versions ( http://kegel.com/linux/asus-g60jx-laptop.html ).

  As with previous versions of Ubuntu, the Live CD / normal desktop installer couldn't get graphics right, so used alternate install iso, and had to specify "nomodeset" on kernel commandline after installation to get any graphics.
  Was able to do a complete software update, then rebooted.  After that, networking seemed flakier.
  When I try downloading the nvidia display driver with "Additional Drivers", the download seems
  to hang after a few seconds.  Rebooting and retrying doesn't help.  

  There were several crashes, and apport collected data for them and
  even uploaded one of them, but I was unable to finish the login
  process at launchpad.  I had to reboot to 11.04 to file this report.

  This is all with wired networking, as wireless doesn't work at all.

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