With Ubuntu 20.10 it works:

Description:    Ubuntu 20.10
Release:        20.10


[Wed Oct  6 12:29:48 2021] usb 1-3: new high-speed USB device number 11 using 
xhci_hcd
[Wed Oct  6 12:29:48 2021] usb 1-3: New USB device found, idVendor=19d2, 
idProduct=1588, bcdDevice= 0.00
[Wed Oct  6 12:29:48 2021] usb 1-3: New USB device strings: Mfr=2, Product=3, 
SerialNumber=5
[Wed Oct  6 12:29:48 2021] usb 1-3: Product: ZTE Mobile Broadband Station
[Wed Oct  6 12:29:48 2021] usb 1-3: Manufacturer: ZTE,Incorporated
[Wed Oct  6 12:29:48 2021] usb 1-3: SerialNumber: 1234567890ABCDEF
[Wed Oct  6 12:29:48 2021] usb-storage 1-3:1.0: USB Mass Storage device detected
[Wed Oct  6 12:29:48 2021] scsi host4: usb-storage 1-3:1.0
[Wed Oct  6 12:29:49 2021] scsi 4:0:0:0: CD-ROM            ZTE       USB SCSI 
CD-ROM 2.31 PQ: 0 ANSI: 0 CCS
[Wed Oct  6 12:29:49 2021] scsi 4:0:0:1: Direct-Access     ZTE      MMC Storage 
     2.31 PQ: 0 ANSI: 0 CCS
[Wed Oct  6 12:29:49 2021] sr 4:0:0:0: [sr0] scsi3-mmc drive: 0x/0x caddy
[Wed Oct  6 12:29:49 2021] sr 4:0:0:0: Attached scsi CD-ROM sr0
[Wed Oct  6 12:29:49 2021] sr 4:0:0:0: Attached scsi generic sg3 type 5
[Wed Oct  6 12:29:49 2021] sd 4:0:0:1: Attached scsi generic sg4 type 0
[Wed Oct  6 12:29:49 2021] sd 4:0:0:1: [sdd] 0 512-byte logical blocks: (0 B/0 
B)
[Wed Oct  6 12:29:49 2021] sd 4:0:0:1: [sdd] 0-byte physical blocks
[Wed Oct  6 12:29:49 2021] sd 4:0:0:1: [sdd] Test WP failed, assume Write 
Enabled
[Wed Oct  6 12:29:49 2021] sd 4:0:0:1: [sdd] Asking for cache data failed
[Wed Oct  6 12:29:49 2021] sd 4:0:0:1: [sdd] Assuming drive cache: write through

[Wed Oct  6 12:30:21 2021] usb 1-3: reset high-speed USB device number 11 using 
xhci_hcd
[Wed Oct  6 12:30:21 2021] sd 4:0:0:1: [sdd] Attached SCSI removable disk
[Wed Oct  6 12:30:22 2021] usb 1-3: reset high-speed USB device number 11 using 
xhci_hcd
[Wed Oct  6 12:30:22 2021] usb 1-3: device firmware changed
[Wed Oct  6 12:30:22 2021] usb 1-3: USB disconnect, device number 11
[Wed Oct  6 12:30:22 2021] scsi 4:0:0:0: rejecting I/O to dead device
[Wed Oct  6 12:30:22 2021] sr0: detected capacity change from 77322240 to 0
[Wed Oct  6 12:30:22 2021] usb 1-3: new high-speed USB device number 12 using 
xhci_hcd
[Wed Oct  6 12:30:22 2021] usb 1-3: New USB device found, idVendor=19d2, 
idProduct=1589, bcdDevice= 0.00
[Wed Oct  6 12:30:22 2021] usb 1-3: New USB device strings: Mfr=10, Product=11, 
SerialNumber=13
[Wed Oct  6 12:30:22 2021] usb 1-3: Product: ZTE Mobile Broadband Station
[Wed Oct  6 12:30:22 2021] usb 1-3: Manufacturer: ZTE,Incorporated
[Wed Oct  6 12:30:22 2021] usb 1-3: SerialNumber: 1234567890ABCDEF
[Wed Oct  6 12:30:22 2021] cdc_ether 1-3:1.0 usb0: register 'cdc_ether' at 
usb-0000:00:14.0-3, ZTE CDC Ethernet Device, 62:4c:3e:99:4d:38
[Wed Oct  6 12:30:22 2021] option 1-3:1.2: GSM modem (1-port) converter detected
[Wed Oct  6 12:30:22 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB0
[Wed Oct  6 12:30:22 2021] option 1-3:1.3: GSM modem (1-port) converter detected
[Wed Oct  6 12:30:22 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB1
[Wed Oct  6 12:30:22 2021] option 1-3:1.4: GSM modem (1-port) converter detected
[Wed Oct  6 12:30:22 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB2
[Wed Oct  6 12:30:22 2021] option 1-3:1.5: GSM modem (1-port) converter detected
[Wed Oct  6 12:30:22 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB3
[Wed Oct  6 12:30:22 2021] usb-storage 1-3:1.6: USB Mass Storage device detected
[Wed Oct  6 12:30:22 2021] scsi host5: usb-storage 1-3:1.6
[Wed Oct  6 12:30:23 2021] scsi 5:0:0:0: CD-ROM            ZTE      USB SCSI 
CD-ROM  2.31 PQ: 0 ANSI: 0 CCS
[Wed Oct  6 12:30:23 2021] scsi 5:0:0:1: Direct-Access     ZTE      MMC Storage 
     2.31 PQ: 0 ANSI: 0 CCS
[Wed Oct  6 12:30:23 2021] sr 5:0:0:0: [sr0] scsi3-mmc drive: 0x/0x caddy
[Wed Oct  6 12:30:23 2021] sr 5:0:0:0: Attached scsi CD-ROM sr0
[Wed Oct  6 12:30:23 2021] sr 5:0:0:0: Attached scsi generic sg3 type 5
[Wed Oct  6 12:30:23 2021] scsi 5:0:0:1: Attached scsi generic sg4 type 0
[Wed Oct  6 12:30:53 2021] cdc_ether 1-3:1.0 usb0: unregister 'cdc_ether' 
usb-0000:00:14.0-3, ZTE CDC Ethernet Device
[Wed Oct  6 12:30:53 2021] option1 ttyUSB0: GSM modem (1-port) converter now 
disconnected from ttyUSB0
[Wed Oct  6 12:30:53 2021] option 1-3:1.2: device disconnected
[Wed Oct  6 12:30:53 2021] option1 ttyUSB1: GSM modem (1-port) converter now 
disconnected from ttyUSB1
[Wed Oct  6 12:30:53 2021] option 1-3:1.3: device disconnected
[Wed Oct  6 12:30:53 2021] option1 ttyUSB2: GSM modem (1-port) converter now 
disconnected from ttyUSB2
[Wed Oct  6 12:30:53 2021] option 1-3:1.4: device disconnected
[Wed Oct  6 12:30:53 2021] option1 ttyUSB3: GSM modem (1-port) converter now 
disconnected from ttyUSB3
[Wed Oct  6 12:30:53 2021] option 1-3:1.5: device disconnected
[Wed Oct  6 12:30:53 2021] usb 1-3: reset high-speed USB device number 12 using 
xhci_hcd
[Wed Oct  6 12:30:54 2021] cdc_ether 1-3:1.0 usb0: register 'cdc_ether' at 
usb-0000:00:14.0-3, ZTE CDC Ethernet Device, da:b5:d9:9e:83:88
[Wed Oct  6 12:30:54 2021] option 1-3:1.2: GSM modem (1-port) converter detected
[Wed Oct  6 12:30:54 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB0
[Wed Oct  6 12:30:54 2021] option 1-3:1.3: GSM modem (1-port) converter detected
[Wed Oct  6 12:30:54 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB1
[Wed Oct  6 12:30:54 2021] option 1-3:1.4: GSM modem (1-port) converter detected
[Wed Oct  6 12:30:54 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB2
[Wed Oct  6 12:30:54 2021] option 1-3:1.5: GSM modem (1-port) converter detected
[Wed Oct  6 12:30:54 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB3
[Wed Oct  6 12:30:54 2021] sd 5:0:0:1: [sdd] Attached SCSI removable disk

[Wed Oct  6 12:31:24 2021] cdc_ether 1-3:1.0 usb0: unregister 'cdc_ether' 
usb-0000:00:14.0-3, ZTE CDC Ethernet Device
[Wed Oct  6 12:31:24 2021] option1 ttyUSB0: GSM modem (1-port) converter now 
disconnected from ttyUSB0
[Wed Oct  6 12:31:24 2021] option 1-3:1.2: device disconnected
[Wed Oct  6 12:31:24 2021] option1 ttyUSB1: GSM modem (1-port) converter now 
disconnected from ttyUSB1
[Wed Oct  6 12:31:24 2021] option 1-3:1.3: device disconnected
[Wed Oct  6 12:31:24 2021] option1 ttyUSB2: GSM modem (1-port) converter now 
disconnected from ttyUSB2
[Wed Oct  6 12:31:24 2021] option 1-3:1.4: device disconnected
[Wed Oct  6 12:31:24 2021] option1 ttyUSB3: GSM modem (1-port) converter now 
disconnected from ttyUSB3
[Wed Oct  6 12:31:24 2021] option 1-3:1.5: device disconnected
[Wed Oct  6 12:31:24 2021] usb 1-3: reset high-speed USB device number 12 using 
xhci_hcd
[Wed Oct  6 12:31:24 2021] cdc_ether 1-3:1.0 usb0: register 'cdc_ether' at 
usb-0000:00:14.0-3, ZTE CDC Ethernet Device, 46:a1:51:77:08:e9
[Wed Oct  6 12:31:24 2021] option 1-3:1.2: GSM modem (1-port) converter detected
[Wed Oct  6 12:31:24 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB1
[Wed Oct  6 12:31:24 2021] option 1-3:1.3: GSM modem (1-port) converter detected
[Wed Oct  6 12:31:24 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB2
[Wed Oct  6 12:31:24 2021] option 1-3:1.4: GSM modem (1-port) converter detected
[Wed Oct  6 12:31:24 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB3
[Wed Oct  6 12:31:24 2021] option 1-3:1.5: GSM modem (1-port) converter detected
[Wed Oct  6 12:31:24 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB4

]Wed Oct  6 12:31:55 2021] cdc_ether 1-3:1.0 usb0: unregister 'cdc_ether' 
usb-0000:00:14.0-3, ZTE CDC Ethernet Device
[Wed Oct  6 12:31:55 2021] option1 ttyUSB1: GSM modem (1-port) converter now 
disconnected from ttyUSB1
[Wed Oct  6 12:31:55 2021] option 1-3:1.2: device disconnected
[Wed Oct  6 12:31:55 2021] option1 ttyUSB2: GSM modem (1-port) converter now 
disconnected from ttyUSB2
[Wed Oct  6 12:31:55 2021] option 1-3:1.3: device disconnected
[Wed Oct  6 12:31:55 2021] option1 ttyUSB3: GSM modem (1-port) converter now 
disconnected from ttyUSB3
[Wed Oct  6 12:31:55 2021] option 1-3:1.4: device disconnected
[Wed Oct  6 12:31:55 2021] option1 ttyUSB4: GSM modem (1-port) converter now 
disconnected from ttyUSB4
[Wed Oct  6 12:31:55 2021] option 1-3:1.5: device disconnected
[Wed Oct  6 12:31:55 2021] usb 1-3: reset high-speed USB device number 12 using 
xhci_hcd
[Wed Oct  6 12:31:55 2021] cdc_ether 1-3:1.0 usb0: register 'cdc_ether' at 
usb-0000:00:14.0-3, ZTE CDC Ethernet Device, 56:4e:b6:04:f6:a9
[Wed Oct  6 12:31:55 2021] option 1-3:1.2: GSM modem (1-port) converter detected
[Wed Oct  6 12:31:55 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB0
[Wed Oct  6 12:31:55 2021] option 1-3:1.3: GSM modem (1-port) converter detected
[Wed Oct  6 12:31:55 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB1
[Wed Oct  6 12:31:55 2021] option 1-3:1.4: GSM modem (1-port) converter detected
[Wed Oct  6 12:31:55 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB2
[Wed Oct  6 12:31:55 2021] option 1-3:1.5: GSM modem (1-port) converter detected
[Wed Oct  6 12:31:55 2021] usb 1-3: GSM modem (1-port) converter now attached 
to ttyUSB3
[Wed Oct  6 12:31:55 2021] ISO 9660 Extensions: Microsoft Joliet Level 1
[Wed Oct  6 12:31:55 2021] ISOFS: changing to secondary root

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https://bugs.launchpad.net/bugs/1946229

Title:
  ZTE Modem USB stick not recognized

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