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
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