i downgraded ModemManager back to 1.6.8-2ubuntu1 and the problem went away, so it is caused by ModemManager.
attached are the logs for ModemManager 1.6.8-2ubuntu1 ** Attachment added: "mm.log" https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/1819615/+attachment/5260385/+files/mm.log -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to modemmanager in Ubuntu. https://bugs.launchpad.net/bugs/1819615 Title: For additional hardware support, modemmanager needs to be upgraded to 1.10 on Bionic Status in OEM Priority Project: In Progress Status in libmbim package in Ubuntu: Fix Released Status in libqmi package in Ubuntu: Fix Released Status in modemmanager package in Ubuntu: Fix Released Status in libmbim source package in Bionic: Fix Committed Status in libqmi source package in Bionic: Fix Committed Status in modemmanager source package in Bionic: Fix Committed Bug description: [Impact] * The new modemmanager package adds DW5820e and DW5821 support. * This modemmanager version is needed to support new devices. [Test Case] * install modemmanager, libmbim, and libqmi from -proposed * reboot and try WWAN function to see if any regression there. * perform general dogfooding of its reverse dependencies (network- manager, gnome-control-center etc.) [Regression Potential] * The package comes from Disco and should not have regression there. * Every new upstream release can potentially break existing dependencies if any of the required features have been changed/removed, so besides regular testing a general dogfooding session with the new modemmanager is advised. [Original Description] To have Bionic, the current LTS, working with as wide of a range of modems as possible we need to have it upgraded to the current 1.10 versions. Also the underlying libraries need to get upgraded appropriately. To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1819615/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
