Add me to the stymied list of victims!  My USR Model 5637 does not
work either.  For me, the only sign that the modem even exists is at the
USB (hardware) level.

~$ uname -a
Linux gandalf 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:05:01 UTC 2009 
x86_64 GNU/Linux
~$ lsusb
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 002: ID 046d:c512 Logitech, Inc. LX-700 Cordless Desktop Receiver
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 0baf:0303 U.S. Robotics 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
/dev$ ls -l *ACM*
crw-rw---- 1 root dialout 166, 0 2009-11-14 13:33 ttyACM0

And yes, I've rebooted post install of the USR modem.  I've got a nice
power light showing on it.  I've got both usb-storage and usbserial
drivers - e.g.

~$ modprobe -l usbserial 
kernel/drivers/usb/serial/usbserial.ko
~$ modprobe -l usb-storage
kernel/drivers/usb/storage/usb-storage.ko

Even so, GNOME PPP just *CANNOT* find/detect the modem!  Under
Applications -> Systems Tools -> Device Manager, showing 'properties'
(for the USB Modem's Serial Port) reveals that this hardware shows up as
/dev/ttyACM0.  Manually entering /dev/ttyACM0 (into GNOME PPP) and
pressing the Detect button generates a complaint about 'No Modem found
in your system'.

Trying to go direct to /dev/ttyACM0 via gtkterm generates a 'Device or
Resource Busy error' ... and this looks like it might relate to this
nasty problem:  http://ubuntuforums.org/showthread.php?t=1325677 (and
maybe this too http://ubuntuforums.org/showthread.php?t=1296460).  Does
this really have something to do with the removal of some hardware
abstraction layer (HAL) in Ubuntu 9.10 (Karmic Koala)?

I'm astonished that using a (new but proper) USB modem (as opposed to a
half-baked WinModem) would soak so much time/effort.  Does anyone have a
suggestion about next steps (and/or further diagnostics/debugging).  I'm
sort of getting down the bottom of my bag of easy tricks ... and I'd
hate to start *REALLY* sinking time into something as tangential/trivial
as a PPP dial up connection.  Geesh.  It is 2009 ...

-- 
gnome-ppp fails under 9.10, works under 9.04
https://bugs.launchpad.net/bugs/469881
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