CF-31 MK4 MC7750 WWAN and Ubuntu Linux

I've had a hard time getting this to work in Ubuntu 16.04 LTS Linux (maybe any Linux?) WWAN would connect very briefly, then disconnect. I finally found the solution (at least for me) here:

https://askubuntu.com/questions/129406/modem-manager-not-working

My MC7750-centric adaptation (just substituted device identifier of my device) of AlexFish's instructions:

1. Run lsusb to get the device's identifying numbers. For Panasonic Sierra MC7750 WWAN card, it is 1199:68a2. (If this is not your identifying numbers, replace each instance of 1199 and 68a2 below with the correct values for the device on your system, as revealed in each step.)
   
   
2. Create and Edit the file /usr/bin/option_1199:68a2 as root, giving it the contents:
   

#! /bin/bash
echo 1199 68a2 > /sys/bus/usb-serial/drivers/option1/new_id

1. Make it executable:
   

chmod +x /usr/bin/option_ 1199:68a2

1. Edit /etc/udev/rules.d/option.rules as root, adding:
   

ATTRS{idVendor}==" 1199", ATTRS{idProduct}==" 68a2", RUN+="/sbin/modprobe option"
ATTRS{idVendor}==" 1199", ATTRS{idProduct}==" 68a2", RUN+="/usr/bin/option_ 1199:68a2"

1. It may work immediately; otherwise unplug it from the machine and plug it back in.
   

Also, I used Modem Manager GUI to activate MC7750, as it did not show up in Network Manager (Network Connections) until I did this.

This information found at:

https://askubuntu.com/questions/129406/modem-manager-not-working