Public bug reported:
Testing the current Ubuntu 26.04 Daily Build (Live USB). The Quectel
EM120R-GL WWAN modem is correctly recognized by Kernel 7.0 and
ModemManager. FCC unlock script runs successfully. However,
NetworkManager fails to establish the connection and disconnects
immediately.
Hardware:
Lenovo ThinkPad P14s
Modem: Quectel EM120R-GL
Steps to reproduce:
Boot Ubuntu 26.04 Daily Live USB
Apply FCC unlock via terminal (sudo ln -sft /etc/ModemManager/fcc-
unlock.d ...)
Restart ModemManager and NetworkManager
Add correct APN (web.vodafone.de) and set IPv4 to auto, IPv6 to
disabled
Connect via nmcli connection up
Expected behavior:
Connection successfully established.
Actual behavior:
Connection fails with "Unknown error".
Logs (journalctl -u NetworkManager):
device (wwan0mbim0): error setting IPv4 forwarding to '0': Invalid argument
state change: prepare -> disconnected (reason 'user-requested', managed-type:
'full')
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2147146
Title:
Ubuntu 26.04 Daily: Quectel EM120R-GL fails to connect via MBIM (IPv4
forwarding Invalid argument)
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