Regarding my netplan file. First, let me state that I can no longer
provide a stable netplan file or the one that was in use before the
application of 26.04.1. I had set my wired interface link negotiation to
manual, speed 1Gb/s and duplex to full. IPv6 was disabled and IPv4 was
hardcoded to 192.168.1.105 and my ISP (ATT) default gateway of
192.168.1.254. Despite the 192.168.1.105 being in ATT DHCP range, it
never seemed to bother the ATT gateway. But upon finding they don't
manage addresses below 192.168.1.64, I changed the fixed address to
192.168.1.15. Despite this, I see repeated the following in syslog,
"enp129s0: NIC Link is Up 2500 Mbps Full Duplex, Flow Control: RX/TX".
That seems to be a default driver speed, unless I'm wrong. Did the
driver change? I'm network cabling hasn't changed in years and has been
rock solid.
etwork:
version: 2
ethernets:
NM-e661012a-2a83-3216-a38f-2735a9547495:
renderer: NetworkManager
match:
name: "enp129s0"
macaddress: "18:3D:2D:96:1B:8E"
addresses:
- "192.168.1.15/24"
nameservers:
addresses:
- 1.1.1.1
- 8.8.8.8
gateway4: 192.168.1.254
ipv6-address-generation: "stable-privacy"
wakeonlan: true
networkmanager:
uuid: "e661012a-2a83-3216-a38f-2735a9547495"
name: "Wired connection 1"
passthrough:
connection.autoconnect-priority: "1"
connection.timestamp: "1788271476"
ethernet.duplex: "full"
ethernet.speed: "1000"
ipv4.may-fail: "false"
ipv6.method: "disabled"
ipv6.ip6-privacy: "-1"
proxy._: ""
Note that I set autoconnect to false and the log state changes show,
despite that. Then I enabled this connection in NM UI and this is what
the logs show:
2026-09-01T10:06:25.425206-05:00 gnosis configure[136914]: `gateway4` has been
deprecated, use default routes instead.#012See the 'Default routes' section of
the documentation for more details.
2026-09-01T10:06:25.425334-05:00 gnosis configure[136914]: `gateway4` has been
deprecated, use default routes instead.#012See the 'Default routes' section of
the documentation for more details.
2026-09-01T10:06:25.425370-05:00 gnosis configure[136914]: Problem encountered
while validating default route consistency.Please set up multiple routing
tables and use `routing-policy` instead.#012Error: Conflicting default route
declarations for IPv4 (table: main, metric: default), first declared in
NM-e661012a-2a83-3216-a38f-2735a9547495 but also in enp129s0
2026-09-01T10:06:25.426297-05:00 gnosis NetworkManager[1452]: <info>
[1788275185.4261] audit: op="connection-update"
uuid="e661012a-2a83-3216-a38f-2735a9547495" name="Wired connection 1"
args="ipv4.addresses,ipv4.gateway,ipv4.may-fail,ipv4.method,ipv4.dns,connection.autoconnect,connection.timestamp"
pid=5927 uid=1000 result="success"
2026-09-01T10:06:25.426363-05:00 gnosis NetworkManager[1452]: <info>
[1788275185.4262] policy: auto-activating connection 'Wired connection 1'
(e661012a-2a83-3216-a38f-2735a9547495)
2026-09-01T10:06:25.426400-05:00 gnosis NetworkManager[1452]: <info>
[1788275185.4263] device (enp129s0): Activation: starting connection 'Wired
connection 1' (e661012a-2a83-3216-a38f-2735a9547495)
2026-09-01T10:06:25.426432-05:00 gnosis NetworkManager[1452]: <info>
[1788275185.4264] device (enp129s0): state change: disconnected -> prepare
(reason 'none', managed-type: 'full')
2026-09-01T10:06:25.427087-05:00 gnosis kernel: igc 0000:81:00.0 enp129s0:
Force mode currently not supported
2026-09-01T10:06:25.488014-05:00 gnosis NetworkManager[1452]: <info>
[1788275185.4878] device (enp129s0): state change: prepare -> config (reason
'none', managed-type: 'full')
2026-09-01T10:06:25.496601-05:00 gnosis NetworkManager[1452]: <info>
[1788275185.4959] device (enp129s0): state change: config -> ip-config (reason
'none', managed-type: 'full')
2026-09-01T10:06:25.497021-05:00 gnosis NetworkManager[1452]: <info>
[1788275185.4969] manager: NetworkManager state is now CONNECTING
2026-09-01T10:06:25.497072-05:00 gnosis NetworkManager[1452]: <info>
[1788275185.4970] policy: set 'Wired connection 1' (enp129s0) as default for
IPv4 routing and DNS
2026-09-01T10:06:25.498518-05:00 gnosis dbus-daemon[1375]: [system] Activating
via systemd: service name='org.freedesktop.nm_dispatcher'
unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.8' (uid=0
pid=1452 comm="/usr/sbin/NetworkManager --no-daemon" label="unconfined")
2026-09-01T10:06:25.499288-05:00 gnosis systemd-resolved[506]: enp129s0: Bus
client set default route setting: yes
2026-09-01T10:06:25.499868-05:00 gnosis systemd-resolved[506]: enp129s0: Bus
client set DNS server list to: 1.1.1.1, 8.8.8.8
2026-09-01T10:06:25.500715-05:00 gnosis systemd[1]: Starting
NetworkManager-dispatcher.service - Network Manager Script Dispatcher Service...
2026-09-01T10:06:25.527028-05:00 gnosis dbus-daemon[1375]: [system]
Successfully activated service 'org.freedesktop.nm_dispatcher'
2026-09-01T10:06:25.527552-05:00 gnosis systemd[1]: Started
NetworkManager-dispatcher.service - Network Manager Script Dispatcher Service.
2026-09-01T10:06:27.498946-05:00 gnosis NetworkManager[1452]: <info>
[1788275187.4985] device (enp129s0): state change: ip-config -> ip-check
(reason 'none', managed-type: 'full')
2026-09-01T10:06:27.501027-05:00 gnosis NetworkManager[1452]: <info>
[1788275187.5009] device (enp129s0): state change: ip-check -> secondaries
(reason 'none', managed-type: 'full')
2026-09-01T10:06:27.501199-05:00 gnosis NetworkManager[1452]: <info>
[1788275187.5011] device (enp129s0): state change: secondaries -> activated
(reason 'none', managed-type: 'full')
2026-09-01T10:06:27.501395-05:00 gnosis NetworkManager[1452]: <info>
[1788275187.5013] manager: NetworkManager state is now CONNECTED_GLOBAL
2026-09-01T10:06:27.501577-05:00 gnosis NetworkManager[1452]: <info>
[1788275187.5015] device (enp129s0): Activation: successful, device activated.
2026-09-01T10:06:29.375089-05:00 gnosis kernel: igc 0000:81:00.0 enp129s0: NIC
Link is Up 2500 Mbps Full Duplex, Flow Control: RX/TX
2026-09-01T10:06:29.375273-05:00 gnosis NetworkManager[1452]: <info>
[1788275189.3749] device (enp129s0): carrier: link connected
2026-09-01T10:06:37.525936-05:00 gnosis systemd[1]:
NetworkManager-dispatcher.service: Deactivated successfully.
2026-09-01T10:06:37.837093-05:00 gnosis kernel: igc 0000:81:00.0 enp129s0: NIC
Link is Down
2026-09-01T10:06:43.840232-05:00 gnosis NetworkManager[1452]: <info>
[1788275203.8397] device (enp129s0): state change: activated -> unavailable
(reason 'carrier-changed', managed-type: 'full')
2026-09-01T10:06:43.929876-05:00 gnosis NetworkManager[1452]: <info>
[1788275203.9296] policy: set '0EyQGVqx6lyJ' (wlp130s0f0) as default for IPv4
routing and DNS
2026-09-01T10:06:43.930110-05:00 gnosis dbus-daemon[1375]: [system] Activating
via systemd: service name='org.freedesktop.nm_dispatcher'
unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.8' (uid=0
pid=1452 comm="/usr/sbin/NetworkManager --no-daemon" label="unconfined")
2026-09-01T10:06:43.932231-05:00 gnosis systemd[1]: Starting
NetworkManager-dispatcher.service - Network Manager Script Dispatcher Service...
2026-09-01T10:06:43.933463-05:00 gnosis systemd-resolved[506]: enp129s0: Bus
client set default route setting: no
2026-09-01T10:06:43.933801-05:00 gnosis systemd-resolved[506]: enp129s0: Bus
client reset DNS server list.
2026-09-01T10:06:43.950513-05:00 gnosis dbus-daemon[1375]: [system]
Successfully activated service 'org.freedesktop.nm_dispatcher'
2026-09-01T10:06:43.950568-05:00 gnosis systemd[1]: Started
NetworkManager-dispatcher.service - Network Manager Script Dispatcher Service.
2026-09-01T10:06:53.970564-05:00 gnosis systemd[1]:
NetworkManager-dispatcher.service: Deactivated successfully.
** Changed in: netplan.io (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/2165906
Title:
Netplan seems messed up since 26.04.1 - cant connect from ethernet
cable
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