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["Matias N. Goldberg" <2056217@xxxxxxxxxxxxxxxxxx>]

The only workaround I found is to manually edit the YAML plan in
/etc/netplan by adding:

      ipv6-address-generation: "eui64"
      ipv6.token "::13"
      ipv6-privacy: true

And then:

sudo nmcli connection reload
sudo nmcli connection up "Wired Connection 1"

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https://bugs.launchpad.net/bugs/2056217

Title:
  nmcli regression: can't set IPV6 token

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  24.04 nightly, downloaded Mar 5.

  network-manager 1.45.90-1ubuntu1

  In network manager, if you try to set ipv6.token, when you save it
  says

  Error: connection verification failed: ipv6.token: only makes sense
  with EUI64 address generation mode

  This is the same as under 22.04. However under 22.04 the solution is
  setipv6.addr-gen-mode eui64 along with the token. In 24.04 when you
  save you get

  Error: Failed to save 'netplan-enp3s0'
  (6effa1b1-280b-3785-9b52-c723b445fb3e) connection: failed to update
  connection: netplan: YAML translation failed: Error in network
  definition: enp3s0: ipv6-address-generation and ipv6-address-token are
  mutually exclusive

  There doesn't seem to be any combination involving the token that
  works.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: network-manager 1.45.90-1ubuntu1
  ProcVersionSignature: Ubuntu 6.8.0-11.11-generic 6.8.0-rc4
  Uname: Linux 6.8.0-11-generic x86_64
  ApportVersion: 2.28.0-0ubuntu1
  Architecture: amd64
  CRDA: N/A
  CasperMD5CheckResult: pass
  Date: Tue Mar  5 14:14:01 2024
  InstallationDate: Installed on 2024-03-05 (0 days ago)
  InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Daily amd64 (20240305)
  IpRoute:
   default via 128.6.60.1 dev enp3s0 proto dhcp src 128.6.60.252 metric 100 
   128.6.60.0/24 dev enp3s0 proto kernel scope link src 128.6.60.252 metric 100
  IwConfig:
   lo        no wireless extensions.
   
   enp3s0    no wireless extensions.
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
  RfKill:
   
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-dev:
   DEVICE  TYPE      STATE                   IP4-CONNECTIVITY  IP6-CONNECTIVITY  DBUS-PATH                                  CONNECTION      CON-UUID                              CON-PATH                                           
   enp3s0  ethernet  connected               full              limited           /org/freedesktop/NetworkManager/Devices/2  netplan-enp3s0  6effa1b1-280b-3785-9b52-c723b445fb3e  /org/freedesktop/NetworkManager/ActiveConnection/2 
   lo      loopback  connected (externally)  unknown           unknown           /org/freedesktop/NetworkManager/Devices/1  lo              b04a6583-06fa-4685-bbd9-05171997cf93  /org/freedesktop/NetworkManager/ActiveConnection/1
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI     WWAN-HW  WWAN    
   running  1.45.90  connected  started  full          enabled     missing  enabled  missing  enabled

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