Modem not connecting on Ubuntu 16.04 (whereas it did on Ubuntu 14.04)

[Ajay Garg]

Hi All.

I followed the following steps ::

a)
Installed Ubuntu 16.04.

b)
sudo add-apt-repository -y ppa:aleksander-m/modemmanager-xenial
sudo apt-get update
sudo apt-get install -y modemmanager
sudo reboot


c)
I am using a Sierra modem in QMI-mode.

*lsusb*
*Bus 001 Device 017: ID 1199:68a2 Sierra Wireless, Inc. *
Bus 001 Device 005: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 004: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse
Bus 001 Device 003: ID 413c:2107 Dell Computer Corp.
Bus 001 Device 002: ID 8087:07e6 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


d)
*mmcli -L*

Found 1 modems:
    /org/freedesktop/ModemManager1/Modem/11 [QUALCOMM INCORPORATED] 0

*mmcli -m 11 -e*
successfully enabled the modem

*mmcli -m 11 --set-allowed-modes='2G'*
successfully set current modes in the modem


*mmcli -m 11 --create-bearer="apn=airtelgprs.com
<http://airtelgprs.com>"*Successfully
created new bearer in modem:
    /org/freedesktop/ModemManager1/Bearer/7

*mmcli -m 11 --simple-connect="apn=airtelgprs.com <http://airtelgprs.com>"*
error: couldn't connect the modem: 'Timeout was reached'


I keep getting the timeout-error, irrespecitive of multiple machine-reboots
and modem-resets.

The strangest part is that the same process used to work on Ubuntu-14.04,
so I guess something is screwing up on Ubuntu-16.
I will be grateful to receive any help, kindly let know any
diagnostic-information that would help in catching the root-cause.


Thanks and Regards,
Ajay
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