It sort of happens with the 10.04 LTS live cd, but not exactly the same
way.  It initially fails to connect in the same way as my installed
Ubuntu.  Afterwards, however, I seem to be able to reliably make a
connection manually with the live cd version, where manually making a
connection with my installed version is much trickier (but eventually
will succeed if I try enough times).  Attached are two logs, the output
of 'tail -f /var/log/*.log' while plugging/unplugging my CDMA mobile
broadband adapter.  The first is when using livecd, the second is when
using my installed ubuntu.

The livecd log has many successful cases in it, but you can see that
just after the device is plugged in, it deactivates the device with a
'reason 2' code.  Perhaps this has something to do with the way the
livecd doesn't want to auto connect to a mobile wireless modem, and is
thus a red herring?

The installed log has no successful cases in it.  After the device is
plugged in, it does the same 'reason 2' deactivation.  However, then it
tries to connect and in fact *succeeds* in connecting.  Then, for some
reason, the modem-manager closes the device.  After that, it does not
respond to activation requests again without being unplugged and
replugged.


** Attachment added: "logs from using livecd"
   
https://bugs.launchpad.net/ubuntu/+bug/641727/+attachment/1619890/+files/logs.livecd

-- 
mobile broadband support unreliable
https://bugs.launchpad.net/bugs/641727
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