Hello,
I tested the systemd with version 257.4-1ubuntu3.2 in the plucky-proposed 
package and confirmed it fixed the problem.
The testing steps I have followed:
1. Set up an IPv6-only environment with iSCSI boot.
2. Enable plucky-proposed repository and upgrade systemd package to 
257.4-1ubuntu3.2
3. Run the networkctl command and verify that no links remain in the 
"configuring" state.
   # networkctl
  IDX LINK TYPE OPERATIONAL SETUP
  1 lo loopback carrier unmanaged
  2 ens300np0 ether routable configured
  3 ens340np0 ether off unmanaged

4. Restart the systemd-networkd-wait-online service and ensure that its status 
does not show error message:
   "Timeout occurred while waiting for network connectivity"
   # systemctl status systemd-networkd-wait-online
● systemd-networkd-wait-online.service - Wait for Network to be Configured
     Loaded: loaded 
(/usr/lib/systemd/system/systemd-networkd-wait-online.service; enabled; preset: 
enabled)
    Drop-In: /run/systemd/system/systemd-networkd-wait-online.service.d
             └─10-netplan.conf
     Active: active (exited) since Tue 2025-09-09 05:38:03 UTC; 4s ago
 Invocation: 07c1e3f62c714a76851bca45a98ecece
       Docs: man:systemd-networkd-wait-online.service(8)
    Process: 4663 ExecStart=/lib/systemd/systemd-networkd-wait-online -i 
ens300np0:degraded (code=exited, status=0/SUCCESS)
    Process: 4664 ExecStart=/lib/systemd/systemd-networkd-wait-online --any 
--dns -o routable -i ens300np0 (code=exited, status=0/SUCCESS)
   Main PID: 4664 (code=exited, status=0/SUCCESS)
   Mem peak: 1.8M
        CPU: 28ms



** Tags removed: verification-needed-plucky
** Tags added: verification-done-plucky

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https://bugs.launchpad.net/bugs/2115418

Title:
  systemd-networkd-wait-online service times out in IPv6-only
  environments

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