Public bug reported:

System:kubuntu 22.04
I create a Dsl connection with network-manager and it works ideal before I 
upgrading the network-manager from 1.35.8X to the higher.
Now I can't connect to the Dsl, the network-manager reports errors. I found the 
messages in the syslogs as this:

Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.3773] 
ppp-manager: starting PPP connection
Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.3788] 
ppp-manager: pppd started with pid 1897
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Plugin rp-pppoe.so loaded.
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Plugin rp-pppoe.so loaded.
Feb 24 08:53:59 kUbuntu-Server kernel: [  184.286354] r8169 0000:04:01.0 
enp4s1: Link is Up - 1Gbps/Full - flow control rx/tx
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Plugin 
/usr/lib/pppd/2.4.9/nm-pppd-plugin.so loaded.
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Plugin 
/usr/lib/pppd/2.4.9/nm-pppd-plugin.so loaded.
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: initializing
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: pppd 2.4.9 started by root, uid 0
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: status 3 / phase 
'serial connection'
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: PPP session is 56656
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: PPP session is 56656
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Connected to cc:1a:fa:e8:2a:20 via 
interface enp4s1
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Connected to 
cc:1a:fa:e8:2a:20 via interface enp4s1
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Using interface ppp0
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: status 5 / phase 
'establish'
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Using interface ppp0
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Connect: ppp0 <--> enp4s1
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Connect: ppp0 <--> enp4s1
Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.5519] 
manager: (ppp0): new Ppp device (/org/freedesktop/NetworkManager/Devices/10)
Feb 24 08:53:59 kUbuntu-Server systemd-udevd[1900]: Using default interface 
naming scheme 'v249'.
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: status 6 / phase 
'authenticate'
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: passwd-hook, 
requesting credentials...
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: got credentials from 
NetworkManager
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Remote message: SUCCESS.
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Remote message: SUCCESS.
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: PAP authentication 
succeeded
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: peer from calling number 
CC:1A:FA:E8:2A:20 authorized
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: status 8 / phase 
'network'
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: PAP authentication succeeded
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: peer from calling number 
CC:1A:FA:E8:2A:20 authorized
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: local  IP address *.*.*.*(I marked 
the IP)
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: status 9 / phase 
'running'
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: local  IP address 
*.*.*.*(I marked the IP)
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: remote IP address 
*.*.*.*(I marked the IP)
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: primary   DNS address 
*.*.*.*(I marked the IP)
Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: secondary DNS address 
*.*.*.*(I marked the IP)
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: remote IP address *.*.*.*(I marked 
the IP)
Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.8762] 
device (ppp0): state change: unmanaged -> unavailable (reason 
'connection-assumed', sys-iface-state: 'external')
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: primary   DNS address *.*.*.*(I 
marked the IP)
Feb 24 08:53:59 kUbuntu-Server pppd[1897]: secondary DNS address *.*.*.*(I 
marked the IP)
Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.8767] 
device (ppp0): state change: unavailable -> disconnected (reason 'none', 
sys-iface-state: 'external')
Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <warn>  [1645664039.8773] 
device (enp4s1): could not take control of link 10: the device already has 
ifindex 2
Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.8774] 
device (enp4s1): state change: config -> failed (reason 'config-failed', 
sys-iface-state: 'managed')
Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.8777] 
manager: NetworkManager state is now CONNECTED_LOCAL
Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <warn>  [1645664039.8779] 
device (enp4s1): Activation: failed for connection 'PPPonEnp4s1'

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1962093

Title:
  network-manager can't connect to pppoe since version 1.35.90

Status in network-manager package in Ubuntu:
  New

Bug description:
  System:kubuntu 22.04
  I create a Dsl connection with network-manager and it works ideal before I 
upgrading the network-manager from 1.35.8X to the higher.
  Now I can't connect to the Dsl, the network-manager reports errors. I found 
the messages in the syslogs as this:

  Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.3773] 
ppp-manager: starting PPP connection
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.3788] 
ppp-manager: pppd started with pid 1897
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Plugin rp-pppoe.so loaded.
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Plugin rp-pppoe.so 
loaded.
  Feb 24 08:53:59 kUbuntu-Server kernel: [  184.286354] r8169 0000:04:01.0 
enp4s1: Link is Up - 1Gbps/Full - flow control rx/tx
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Plugin 
/usr/lib/pppd/2.4.9/nm-pppd-plugin.so loaded.
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Plugin 
/usr/lib/pppd/2.4.9/nm-pppd-plugin.so loaded.
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: initializing
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: pppd 2.4.9 started by root, uid 0
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: status 3 / phase 
'serial connection'
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: PPP session is 56656
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: PPP session is 56656
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Connected to cc:1a:fa:e8:2a:20 via 
interface enp4s1
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Connected to 
cc:1a:fa:e8:2a:20 via interface enp4s1
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Using interface ppp0
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: status 5 / phase 
'establish'
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Using interface ppp0
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Connect: ppp0 <--> enp4s1
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Connect: ppp0 <--> enp4s1
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.5519] 
manager: (ppp0): new Ppp device (/org/freedesktop/NetworkManager/Devices/10)
  Feb 24 08:53:59 kUbuntu-Server systemd-udevd[1900]: Using default interface 
naming scheme 'v249'.
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: status 6 / phase 
'authenticate'
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: passwd-hook, 
requesting credentials...
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: got credentials 
from NetworkManager
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: Remote message: SUCCESS.
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: Remote message: SUCCESS.
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: PAP authentication 
succeeded
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: peer from calling number 
CC:1A:FA:E8:2A:20 authorized
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: status 8 / phase 
'network'
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: PAP authentication succeeded
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: peer from calling number 
CC:1A:FA:E8:2A:20 authorized
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: local  IP address *.*.*.*(I marked 
the IP)
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: nm-ppp-plugin: status 9 / phase 
'running'
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: local  IP address 
*.*.*.*(I marked the IP)
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: remote IP address 
*.*.*.*(I marked the IP)
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: primary   DNS address 
*.*.*.*(I marked the IP)
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[1897]: secondary DNS address 
*.*.*.*(I marked the IP)
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: remote IP address *.*.*.*(I marked 
the IP)
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.8762] 
device (ppp0): state change: unmanaged -> unavailable (reason 
'connection-assumed', sys-iface-state: 'external')
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: primary   DNS address *.*.*.*(I 
marked the IP)
  Feb 24 08:53:59 kUbuntu-Server pppd[1897]: secondary DNS address *.*.*.*(I 
marked the IP)
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.8767] 
device (ppp0): state change: unavailable -> disconnected (reason 'none', 
sys-iface-state: 'external')
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <warn>  [1645664039.8773] 
device (enp4s1): could not take control of link 10: the device already has 
ifindex 2
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.8774] 
device (enp4s1): state change: config -> failed (reason 'config-failed', 
sys-iface-state: 'managed')
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <info>  [1645664039.8777] 
manager: NetworkManager state is now CONNECTED_LOCAL
  Feb 24 08:53:59 kUbuntu-Server NetworkManager[703]: <warn>  [1645664039.8779] 
device (enp4s1): Activation: failed for connection 'PPPonEnp4s1'

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