Please check if you are facing the same as here
https://bugs.launchpad.net/ubuntu/+source/usb-modeswitch/+bug/927954
just put in your stick and then start "dmesg" and look if there is
something about "segfault"
** Changed in: usb-modeswitch (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/915491
Title:
internet stick not recognized by network manager
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