Public bug reported:

Binary package hint: network-manager

I'm using Ubuntu 9.04 Jaunty Jackalope UNR (Ubuntu Netbook Remix), with
kernel linux-image-2.6.30-020630-generic from http://kernel.ubuntu.com
/%7Ekernel-ppa/mainline/v2.6.30/ (however, I doubt the problem is kernel
related as the hso module itself seems to behave correctly).

The Problem: When using an UMTS Connection via network-manager-gnome
[Version: 0.7.1~rc4.1-0ubuntu2], shutting down the system hangs because
the NetworkManager [Version: 0.7.1~rc4.1.cf199a964-0ubuntu2] process
still claims /dev/ttyHS0.

Workaround: Killing NetworkManager and manually rmmod'ing the module hso
remedies the situation and enables the system to shut down cleanly.

Expected Behaviour: NetworkManager should free /dev/ttyHS0 after
termination of the connection or at latest after the UMTS device is
removed, so that the hso module can be cleanly unloaded and doesn't
block the shutdown.

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
[jaunty] NetworkManager won't free /dev/ttyHS0 after disconnecting UMTS
https://bugs.launchpad.net/bugs/408048
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