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[Mark Robbie <868034@xxxxxxxxxxxxxxxxxx>]

Aleksander: I have installed modem-manager 0.4 on my 11.10 system and it
works ok - a debug log is attached (it contains the sequence
connect/disconnect/connect)

It was quite painless for me to install the older release, so this might
be a suitable interim solution for some other people who are having this
problem.

To install the version from Natty you need to:

Step 1:
Fetch the old .deb file. You can get this from:
http://packages.ubuntu.com/natty/modemmanager
In the section "Download modemmanager" click on either amd64 or i386 as appropriate for your machine and save the file somewhere.

I'm using 64-bit so the file I retrieved is called:
modemmanager_0.4+git.20110124t203624.00b6cce-2ubuntu1_amd64.deb

Step 2:
Remove the current (broken) version of modemmanager from your machine.
sudo dpkg --purge modemmanager

Step 3:
Install the older version that you downloaded in Step 1.
sudo dpkg -i modemmanager_0.4+git.20110124t203624.00b6cce-2ubuntu1_amd64.deb

Step 4:
(not 100% sure this is needed but won't hurt)
Bounce the NetworkManager
sudo stop network-manager
sudo start network-manager

The modem should now work as it did in 11.04.

You might want to perform an additional step to prevent the update
manager from reinstalling the broken version:

Optional Step 5:
Start the Synaptic Package Manager
Find modemmanager in the packages list. It should look something like:
S | | Package          | Installed Version                                                       | Latest Version | Description
! modemmanager | 0.4+git.20110124t203624.00b6cce-2ubuntu1| 0.5-1ubuntu1 | D-Bus service for managing modems

Click on the modemmanager package, then from the menu select Package ->
Lock Version

Obviously at some future time when this bug is fixed you will want to
unlock this version by again selecting Package -> Lock Version

** Attachment added: "Natty modem-manager on Oneiric"
   https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/868034/+attachment/2662771/+files/modem-manager-04-on-1110.log

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https://bugs.launchpad.net/bugs/868034

Title:
  Huawei E220 can't connect on Ubuntu 11.10

Status in ModemManager (with NetworkManager support):
  Unknown
Status in “modemmanager” package in Ubuntu:
  Confirmed
Status in “network-manager” package in Ubuntu:
  In Progress
Status in “modemmanager” package in Debian:
  New
Status in “modemmanager” package in Fedora:
  Unknown

Bug description:
  I'm using Ubuntu in my HP Pavilion dv6745tx laptop. I cannot connect
  the Huawei E220 usb modem since 11.10 beta1 (now I'm in beta2). There
  is  no problem in natty.

  I have found this in syslog

  Oct  5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0) starting connection 'Dialog GSM Postpaid'
  Oct  5 07:10:51 ubuntu NetworkManager[1681]: <info> (ttyUSB0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
  Oct  5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled...
  Oct  5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) started...
  Oct  5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) complete.
  Oct  5 07:10:58 ubuntu NetworkManager[1681]: <warn> GSM connection failed: (32) Sending command failed: 'Resource temporarily unavailable'
  Oct  5 07:10:58 ubuntu NetworkManager[1681]: <info> (ttyUSB0): device state change: prepare -> failed (reason 'unknown') [40 120 1]
  Oct  5 07:10:58 ubuntu NetworkManager[1681]: <warn> Activation (ttyUSB0) failed.
  Oct  5 07:10:58 ubuntu NetworkManager[1681]: <info> (ttyUSB0): device state change: failed -> disconnected (reason 'none') [120 30 0]
  Oct  5 07:10:58 ubuntu NetworkManager[1681]: <info> (ttyUSB0): deactivating device (reason: 0).
  Oct  5 07:10:58 ubuntu NetworkManager[1681]: nm_system_iface_flush_routes: assertion `ifindex > 0' failed
  Oct  5 07:10:58 ubuntu NetworkManager[1681]: nm_system_iface_flush_addresses: assertion `ifindex > 0' failed

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