Looks like the same bug to me.
Ubuntu 18.04
Package: modemmanager
Version: 1.6.8-2ubuntu1
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https://bugs.launchpad.net/bugs/111
Title:
modemmanager 1.7.990-1ubuntu1 does not see my u
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: modemmanager (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/111
Title:
may be a duplicate of
https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/106
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https://bugs.launchpad.net/bugs/111
Title:
modemmanager 1.7.990-1ubuntu1 does not see my u