It appears the reason the external dhclient is no longer working is because
it's not explicitly enabled in the current build. This can be seen in the
Plucky build log
https://launchpadlibrarian.net/779900784/buildlog_ubuntu-plucky-amd64.network-manager_1.52.0-1ubuntu1_BUILDING.txt.gz
DHCP clients (default internal):
dhcpcd: true false
dhclient: false (deprecated)
As noted in the NetworkManager changelog (NEWS file):
=============================================
NetworkManager-1.50
Overview of changes since NetworkManager-1.48
=============================================
* The support for "dhclient" has been deprecated, not built unless
explicitely enabled, and will be removed in a future release.
The internal DHCP client should be used instead and has been
the default since version 1.20 (1.12 when built with meson).
However, as mentioned in this bug description, the only way to use the
user-class option currently is via the ISC DHCP client (dhclient).
Until NetworkManager supports this option internally, could you consider
re-enabling dhclient in the build?
I've opened a ticket to track this request.
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/1759
** Bug watch added:
gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues #1759
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/1759
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https://bugs.launchpad.net/bugs/2109975
Title:
NetworkManager cannot work in conjonction with dhclient (isc-dhcp-
client) after Plucky/25.04 upgrade
Status in network-manager package in Ubuntu:
New
Bug description:
After upgrading Kubuntu from Ocular (24.10) to Plucky (25.04), I could
not retrieve an IP address from my corporate network which requires
the user-class (option 77) to be set in the dhclient configuration
file.
Before the upgrade I was able to get an IP address from the DHCP
server through NetworkManager that was set to use the dhclient (isc-
dhcp-client package installed) and with the following lines in the
configuration
[main]
dhcp=dhclient
see
https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/configuring-
networkmanager-dhcp-settings_configuring-and-managing-
networking#proc_changing-the-dhcp-client-of-
networkmanager_configuring-networkmanager-dhcp-settings
Everything worked well up until network-manager 1.48.8-1ubuntu3
(Ocular / 25.10)
But with the recent upgrade to Plucky/25.10 and network-manager
1.52.0-1ubuntu1
there seems to be a regression as I cannot request an IP address anymore with
the same configuration
Here are the errors in syslog
2025-05-05T08:06:49.162450+02:00 myhost NetworkManager[1116]: <warn>
[1746425209.1623] dhcp: init: DHCP client 'dhclient' not available
2025-05-05T08:06:49.162551+02:00 myhost NetworkManager[1116]: <info>
[1746425209.1623] dhcp: init: Using DHCP client 'internal'
and no IP address is assigned to my network card (wired)
NB: there is no IPv6 at stake, only IPv4 address is assigned
the isc-dhcp-client is in version 4.4.3-P1-4ubuntu2 since 24.04 (LTS/Noble)
and no newer version exists, so it doesn't seem to be the culprit
unfortunately, I have to still rely on ISC DHCP client as this is the only
way to configure the user-class option
here is the line I need in the /etc/dhcp/dhclient.conf
send user-class "blabla-XXXX";
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