Looks I can re-create this issue.
Just as a workaround, one may edit /etc/netplan/01-netcfg.yaml
do the configuration in a persistent way there and do a netplan apply:
$ sudo netplan apply --dryrun
$ sudo netplan apply
Please notice that you should have your system always on the latest level -
means today in case of 18.04 it's 18.04.2 (incl. all patches) - 18.04.2
supersedes 18.04.1, but no need for a new install - just keep your system
up-to-date with:
sudo apt update && sudo apt full-upgrade
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Also affects: iproute2 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Status: New => Triaged
** Changed in: ubuntu-z-systems
Importance: Undecided => Medium
** Attachment added: "recreate.txt"
https://bugs.launchpad.net/ubuntu/+source/iproute2/+bug/1838258/+attachment/5279819/+files/recreate.txt
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https://bugs.launchpad.net/bugs/1838258
Title:
Unable to configure VLAN on an additional OSA interface
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