Hi Mario, thanks for the additional testing and logs. Ok, that the modification of the yaml file will not have an impact was kind of expected, but it was to make sure that the parsing itself is fine - since netplan try and apply comes back w/o an error, everything else would have surprised me.
But interesting is that it works for you using the ip command. That makes me think that it's probably an issue with systemd-networkd. So please could you share the output of: networkctl status enP53p0s0.171 --no-pager after the interface got an IP address assigned (so after 'ip addr add ...') and again after such an un-successful netplan apply (so when an address did not got assigned). And while doing that I recommend to update the systemd-networkd loglevel to debug with the following so that we get as much details as possible: $ cat /etc/systemd/system/systemd-networkd.service.d/override.conf [Service] Environment=SYSTEMD_LOG_LEVEL=debug $ systemctl restart systemd-networkd I'll also ave a look at systemd upstream (https://github.com/systemd/systemd/issues/), checking if s/t similar got already reported ... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1929657 Title: [Ubuntu 20.4.2] vLan not getting static IP assigned (on s390x) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1929657/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
