我正在尝试让我的 sim 在 Ubuntu 20.04 中工作，并且我已按照此处指示的步骤进行操作https://ubuntu.com/core/docs/networkmanager/configure-cellular-connections但无济于事。似乎无法激活连接。
Ubuntu 版本：20.04 内核版本：5.13.0-37-generic
一些有用的输出
1.
$ mmcli -L
/org/freedesktop/ModemManager1/Modem/0 [Fibocom Wireless Inc.] DW5820e L850-GL
--------------------------------
General | path: /org/freedesktop/ModemManager1/Modem/0
| device id: 9168cc1181808202f4eea76a3ac738129a172ce3
--------------------------------
Hardware | manufacturer: Fibocom Wireless Inc.
| model: DW5820e L850-GL
| firmware revision: 18500.5001.00.03.25.18
| h/w revision: V1.0.4
| supported: gsm-umts, lte
| current: gsm-umts, lte
| equipment id: 863212038363484
--------------------------------
System | device: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-7
| drivers: cdc_mbim, cdc_acm
| plugin: dell
| primary port: cdc-wdm0
| ports: cdc-wdm0 (mbim), ttyACM0 (at), ttyACM1 (ignored),
| ttyACM2 (ignored), wwan0 (net)
--------------------------------
Status | unlock retries: sim-pin2 (3)
| state: enabled
| power state: on
| signal quality: 0% (cached)
--------------------------------
Modes | supported: allowed: 3g; preferred: none
| allowed: 4g; preferred: none
| allowed: 3g, 4g; preferred: none
| allowed: 3g, 4g; preferred: 3g
| allowed: 3g, 4g; preferred: 4g
| current: allowed: 4g; preferred: none
--------------------------------
Bands | supported: utran-1, utran-4, utran-5, utran-8, utran-2, eutran-1,
| eutran-2, eutran-3, eutran-4, eutran-5, eutran-7, eutran-8,
| eutran-11, eutran-12, eutran-13, eutran-17, eutran-18, eutran-19,
| eutran-20, eutran-21, eutran-26, eutran-28, eutran-29, eutran-30,
| eutran-38, eutran-39, eutran-40, eutran-41, eutran-66
| current: eutran-1, eutran-2, eutran-3, eutran-4, eutran-5, eutran-7,
| eutran-8, eutran-11, eutran-12, eutran-13, eutran-17, eutran-18,
| eutran-19, eutran-20, eutran-21, eutran-26, eutran-28, eutran-29,
| eutran-30, eutran-38, eutran-39, eutran-40, eutran-41, eutran-66
--------------------------------
IP | supported: ipv4, ipv6, ipv4v6
--------------------------------
3GPP | imei: 863212038363484
| enabled locks: fixed-dialing
| registration: idle
--------------------------------
3GPP EPS | ue mode of operation: csps-2
--------------------------------
SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/0
我尝试通过以下方式添加连接：
$nmcli c add type gsm ifname '*' con-name Econet apn econet.net
我使用此命令确认了添加（包括输出）：
$ nmcli con
*snip*
NAME UUID TYPE DEVICE
Econet 4bb5baea-8c99-461d-93d8-3f4a8c59d4d1 gsm --
*snip*
然后我尝试提起这件事：
$nmcli c up Econet
Error: Connection activation failed: Network registration timed out
Hint: use 'journalctl -xe NM_CONNECTION=4bb5baea-8c99-461d-93d8-3f4a8c59d4d1 + NM_DEVICE=cdc-wdm0' to get more details.
日志输出：
$journalctl -xe NM_CONNECTION=4bb5baea-8c99-461d-93d8-3f4a8c59d4d1 + NM_DEVICE=cdc-wdm0 -f
Apr 05 17:12:20 my-pc NetworkManager[1407]: <warn> [1649171540.5580] device (cdc-wdm0): Activation: failed for connection 'Econet'
Apr 05 17:12:20 my-pc NetworkManager[1407]: <info> [1649171540.5584] device (cdc-wdm0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
日志会永远在这两条消息之间交替显示。
我在这里发现了类似的东西：https://superuser.com/questions/1298853/networkmanager-fails-to-start-gsm-connection。然而，尽管我尝试了多次，建议的解决方案对我来说仍然不起作用。
我尝试过 1 张仅支持数据的 SIM 卡和 2 张其他 SIM 卡（并非仅支持数据），但似乎都没有用。
注意：所有 3 张卡均可在 Windows 中使用。
我将非常感激您的任何意见。