我使用 MTS MBLAZE 调制解调器（由中兴通讯制造）连接互联网。通常，Ubuntu 会自动检测调制解调器，并在几秒钟后显示一条通知，提示“移动宽带网络。您已连接到家庭网络”，然后我可以单击“MTS 宽带连接”以连接到互联网。
最近，它停止工作了。我面临两个问题：
1. 调制解调器被检测到但无法连接：我收到“移动宽带网络。您已连接到家庭网络”的通知，然后我可以单击“MTS 宽带连接”，但它给出了“已断开连接 - 您现在处于离线状态”的错误。（调制解调器在 Windows 下工作正常，因此不是由于 ISP 问题）
2. 调制解调器未被检测到：有时调制解调器根本无法被检测到（尽管它会显示在 lsusb 中）。重新连接调制解调器几次通常可以解决这个问题
当调制解调器未被检测到时 lsub 的输出：
Bus 001 Device 012: ID 19d2:fff5 ZTE WCDMA Technologies MSM
当检测到调制解调器时 lsub 的输出：
Bus 001 Device 015: ID 19d2:fff1 ZTE WCDMA Technologies MSM
dmesg 的输出：
[ 279.440291] usb 1-1: new high-speed USB device number 7 using xhci_hcd
[ 279.570655] usb 1-1: New USB device found, idVendor=19d2, idProduct=fff5
[ 279.570660] usb 1-1: New USB device strings: Mfr=3, Product=2, SerialNumber=4
[ 279.570662] usb 1-1: Product: ZTE CDMA Tech
[ 279.570664] usb 1-1: Manufacturer: ZTE, Incorporated
[ 279.570666] usb 1-1: SerialNumber: 80d746de0000
[ 279.574904] usb-storage 1-1:1.0: USB Mass Storage device detected
[ 279.575315] scsi host6: usb-storage 1-1:1.0
[ 280.575963] scsi 6:0:0:0: CD-ROM ZTE USB Storage FFF1 2.31 PQ: 0 ANSI: 2
[ 280.576451] scsi 6:0:0:1: Direct-Access ZTE USB Storage FFF1 2.31 PQ: 0 ANSI: 2
[ 280.578783] sr 6:0:0:0: [sr1] scsi-1 drive
[ 280.579200] sr 6:0:0:0: Attached scsi CD-ROM sr1
[ 280.579437] sr 6:0:0:0: Attached scsi generic sg2 type 5
[ 280.580140] sd 6:0:0:1: Attached scsi generic sg3 type 0
[ 280.582934] sd 6:0:0:1: [sdb] Attached SCSI removable disk
[ 290.624145] usb 1-1: USB disconnect, device number 7
[ 290.992719] usb 1-1: new high-speed USB device number 8 using xhci_hcd
[ 291.197941] usb 1-1: New USB device found, idVendor=19d2, idProduct=fff1
[ 291.197946] usb 1-1: New USB device strings: Mfr=3, Product=2, SerialNumber=4
[ 291.197949] usb 1-1: Product: ZTE CDMA Tech
[ 291.197951] usb 1-1: Manufacturer: ZTE, Incorporated
[ 291.197952] usb 1-1: SerialNumber: 80d746de0000
[ 291.248748] option 1-1:1.0: GSM modem (1-port) converter detected
[ 291.248882] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
[ 291.249017] option 1-1:1.1: GSM modem (1-port) converter detected
[ 291.249104] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
[ 291.249208] option 1-1:1.2: GSM modem (1-port) converter detected
[ 291.249289] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
[ 291.249393] option 1-1:1.3: GSM modem (1-port) converter detected
[ 291.249475] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3
[ 291.249574] option 1-1:1.4: GSM modem (1-port) converter detected
[ 291.249655] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB4
[ 291.249729] usb-storage 1-1:1.5: USB Mass Storage device detected
[ 291.249837] scsi host7: usb-storage 1-1:1.5
[ 292.260108] scsi 7:0:0:0: CD-ROM ZTE USB Storage FFF1 2.31 PQ: 0 ANSI: 2
[ 292.266889] scsi 7:0:0:1: Direct-Access ZTE USB Storage FFF1 2.31 PQ: 0 ANSI: 2
[ 292.284370] sr 7:0:0:0: [sr1] scsi-1 drive
[ 292.284509] sr 7:0:0:0: Attached scsi CD-ROM sr1
[ 292.284833] sr 7:0:0:0: Attached scsi generic sg2 type 5
[ 292.285406] sd 7:0:0:1: Attached scsi generic sg3 type 0
[ 292.364092] sd 7:0:0:1: [sdb] Attached SCSI removable disk
我已经确认 usb-modeswitch 和 usb-modeswitch-data 已安装。无法找出问题所在。