So, the problem appears to be the value of "cloned-mac-address". Netplan only accepts a MAC address, but Network Manager also supports some special settings ("preserve", "permanent", "random" and "stable").
I prepared a fix for that https://github.com/canonical/netplan/pull/376 ** Also affects: netplan.io (Ubuntu) Importance: Undecided Status: New ** Changed in: netplan.io (Ubuntu) Status: New => In Progress ** Changed in: network-manager (Ubuntu) Status: New => Invalid ** Changed in: netplan.io (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/2026230 Title: error when setting up after upgrading Status in netplan.io package in Ubuntu: In Progress Status in network-manager package in Ubuntu: Invalid Bug description: I received an error from apport about a programme not working. I collected the data to submit. Hope this helps. ProblemType: Crash DistroRelease: Ubuntu 23.10 Package: network-manager 1.42.6-2ubuntu1 Uname: Linux 6.2.0-24-generic x86_64 Architecture: amd64 Date: Wed Jul 5 23:11:14 2023 ExecutablePath: /usr/sbin/NetworkManager ExecutableTimestamp: 1687429583 ProcCmdline: /usr/sbin/NetworkManager --no-daemon ProcCwd: / ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) Signal: 6 SourcePackage: network-manager UserGroups: N/A To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/netplan.io/+bug/2026230/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp