This bug was fixed in the package systemd - 232-21ubuntu7
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systemd (232-21ubuntu7) zesty; urgency=medium
* networkd: accept `:' in ifnames in systemd/networkd. (LP: #1714933)
* networkd: add support for ActiveSlave and PrimarySlave netdev options.
(LP: #1709135)
*
systemd (234-2ubuntu1) artful; urgency=medium
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* Enable systemd-resolved by default
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** Changed in: systemd (Ubuntu Artful)
Status: Fix Committed => Fix Released
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** Also affects: systemd (Ubuntu Zesty)
Importance: Undecided
Status: New
** Also affects: systemd (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: systemd (Ubuntu Artful)
Status: New => Fix Committed
** Changed in: systemd (Ubuntu Zesty)