Modem Manager not detecting modem after snap refresh

[Kris Zawada]

Installed Ubuntu-SE30-Core-20220117.img.xz on a Lenovo ThinkEdge SE30 and was able to view the modem using

user1-company@ubuntu:~$ sudo mmcli -L
    /org/freedesktop/ModemManager1/Modem/0 [quectel] EM160R_GL
user1-company@ubuntu:~$

After that configured a connection using Network Manager to get IP address over cellular. About an hour later Snap update ran in the background which caused all the Snap applications to update. The modem stopped being recognized. The output from Modem Manager is:

user1-company@ubuntu:~$ sudo mmcli -L
No modems were found
user1-company@ubuntu:~$

Therefore, the new changes in the latest Modem Manager is causing the modem not to be recognized.

Snap List BEFORE Snap update:
-----------------------------
user1-company@ubuntu:~$ snap list
Name Version Rev Tracking Publisher Notes
bluez 5.53-4 275 20/stable canonical✓ -
core20 20211129 1270 latest/stable canonical✓ base
intel-kernel 5.13.0-1009.9.1 13 20/stable canonical✓ kernel
lenovo-wwan-dpr 1.0.2-wwan-dpr 4 latest/stable lenovo-snap✓ -
modem-manager 1.16.6-2 470 20/stable canonical✓ -
network-manager 1.22.10-9 678 20/stable canonical✓ -
pc 20-0.4 115 20/stable canonical✓ gadget
quectel-firmware-switch 0.1.3 10 latest/stable lenovo-snap✓ -
snapd 2.53.4 14295 latest/stable canonical✓ snapd
user1-commpany@ubuntu:~$

Snap List AFTER Snap update:
----------------------------
user1-company@ubuntu:~$ snap list
Name Version Rev Tracking Publisher Notes
bluez 5.53-7 334 20/stable canonical✓ -
core 16-2.58.3 14946 latest/stable canonical✓ core
core20 20230503 1891 latest/stable canonical✓ base
core22 20230503 634 latest/stable canonical✓ base
intel-kernel 5.15.0-1025.30~20.04.1.1 25 20/stable canonical✓ kernel
lenovo-wwan-dpr 1.0.8.2-wwan-dpr 23 latest/stable lenovo-snap✓ -
modem-manager 1.18.6-2 523 20/stable canonical✓ -
network-manager 1.22.10-19 829 20/stable canonical✓ -
pc 20-0.4 132 20/stable canonical✓ gadget
pciutils 3.3.1-3 3 latest/stable woodrow -
quectel-firmware-switch 0.1.6 20 latest/stable lenovo-snap✓ -
snapd 2.59.2 19122 latest/stable canonical✓ snapd
usbutils-lool None 2 latest/stable lool -
user1-company@ubuntu:~$

The new version of the Modem Manager can no longer detect the modem. The OS version is Ubuntu Core 20.

Attached is the modem log after running the command "sudo journalctl | grep -i modem".