1. please do https://wiki.ubuntu.com/DebuggingModemmanager
2. also check whether you can make your modem work again if you run "sudo
killall modem-manager" before plugging your device in after unplugging
2a. also check whether you can make your modem work again if you run "sudo
killall modem-manager" after plugging your device in after unplugging
3. run apport-collect 446695 to attach more valuable input.
Thanks!
** Changed in: network-manager (Ubuntu)
Status: New => Incomplete
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network-manager does not recognize usb modem when it is plugged in again
https://bugs.launchpad.net/bugs/446695
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