modem-manager-gui not detecting USB modem.

[Suvendu Dey]

I am using 19.10 but modem-manager-gui application not detecting my USB modem. Though
$ lsusb command shows the USB modem.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: linux-image-5.3.0-18-generic 5.3.0-18.19+1
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: suv 1422 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Tue Mar 10 11:43:35 2020
InstallationDate: Installed on 2020-02-22 (16 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 0bda:b009 Realtek Semiconductor Corp. 802.11n WLAN Adapter
 Bus 001 Device 003: ID 04f2:b65d Chicony Electronics Co., Ltd HP TrueVision HD Camera
 Bus 001 Device 002: ID 1c9e:f000 OMEGA TECHNOLOGY USB Modem
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP Laptop 14q-cs0xxx
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-18-generic root=UUID=af2fb778-a6e3-43f3-a550-a826fbce64e2 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.3.0-18-generic N/A
 linux-backports-modules-5.3.0-18-generic N/A
 linux-firmware 1.183
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/27/2018
dmi.bios.vendor: Insyde
dmi.bios.version: F.14
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 849A
dmi.board.vendor: HP
dmi.board.version: KBC Version 74.22
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.14:bd07/27/2018:svnHP:pnHPLaptop14q-cs0xxx:pvrType1ProductConfigId:rvnHP:rn849A:rvrKBCVersion74.22:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Notebook
dmi.product.name: HP Laptop 14q-cs0xxx
dmi.product.sku: 5DZ92PA#ACJ
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP