Public bug reported:

EN-US
After the latest Ubuntu Desktop 26.04 LTS update, the connection was still 
working; I don't know if the problem is with the internet provider or the 
update.

When I try to connect, the connection starts, the selected network name 
disappears, and after selecting the network again, the connection is not 
established, displaying the following log:
------
PT-BR
Após a última atualização do Ubuntu Desktop 26.04 LTS, a conexão ainda 
funcionava; não sei se o problema é com o provedor de internet ou com a 
atualização.

Quando tento conectar, a conexão inicia, o nome da rede selecionada
desaparece e, após seleciona a rede novamente, a conexão não é
estabelecida, exibindo o seguinte log:


logs:
Aug 24 15:26:59 user ModemManager[84087]: <msg> [modem1] set initial EPS bearer 
settings state (1/5): power down
Aug 24 15:27:00 user ModemManager[84087]: <msg> [modem1] power state updated: 
low
Aug 24 15:27:00 user ModemManager[84087]: <msg> [modem1] set initial EPS bearer 
settings state (2/5): update
Aug 24 15:27:00 user ModemManager[84087]: <msg> [modem1] set initial EPS bearer 
settings state (3/5): recover previous power state
Aug 24 15:27:00 user ModemManager[84087]: <msg> [modem1] 3GPP registration 
state changed (home -> searching)
Aug 24 15:27:00 user ModemManager[84087]: <msg> [modem1] state changed 
(registered -> searching)
Aug 24 15:27:02 user ModemManager[84087]: <msg> [modem1] power state updated: on
Aug 24 15:27:02 user ModemManager[84087]: <msg> [modem1] set initial EPS bearer 
settings state (4/5): reload
Aug 24 15:27:02 user ModemManager[84087]: <wrn> [modem1] requested and reloaded 
initial EPS bearer settings don't match
Aug 24 15:27:02 user ModemManager[84087]: <msg> [modem1] set initial EPS bearer 
settings state (5/5): failed
Aug 24 15:27:02 user NetworkManager[84078]: <warn>  [1787596022.3282] 
modem-broadband[ttyUSB2]: failed to set initial EPS bearer settings: 
GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Failed: Failed: Initial 
EPS bearer settings were not updated
Aug 24 15:27:02 user NetworkManager[84078]: <info>  [1787596022.3283] device 
(ttyUSB2): state change: prepare -> failed (reason 'gsm-apn-failed', 
managed-type: 'full')
Aug 24 15:27:02 user NetworkManager[84078]: <info>  [1787596022.3285] manager: 
NetworkManager state is now DISCONNECTED
Aug 24 15:27:02 user NetworkManager[84078]: <warn>  [1787596022.3287] device 
(ttyUSB2): Activation: failed for connection 'Default'
Aug 24 15:27:02 user NetworkManager[84078]: <info>  [1787596022.3289] device 
(ttyUSB2): state change: failed -> disconnected (reason 'none', managed-type: 
'full')
Aug 24 15:27:02 user NetworkManager[84078]: <warn>  [1787596022.3290] device 
(ttyUSB2): error setting IPv4 forwarding to '0': Success
Aug 24 15:27:02 user ModemManager[84087]: <msg> [modem1] 3GPP registration 
state changed (searching -> registering)
Aug 24 15:27:02 user ModemManager[84087]: <msg> [modem1] 3GPP registration 
state changed (registering -> home)
Aug 24 15:27:02 user ModemManager[84087]: <msg> [modem1] state changed 
(searching -> registered)

** Affects: modemmanager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2164955

Title:
  Ubuntu Modemmanage failed to set initial EPS bearer settings:
  GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Failed: Failed:
  Initial EPS bearer settings were not updated

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