I'm closing the LTSP task as LTSP 5.5.6 got released and was published in Xenial without the fix being included, and the newer ifupdown makes the fix not necessary anymore.
** Changed in: ltsp (Ubuntu) Status: Triaged => Won't Fix -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ifupdown in Ubuntu. https://bugs.launchpad.net/bugs/1492546 Title: ifdown stops LTSP's "manual" interface on shutdown Status in ifupdown package in Ubuntu: Fix Released Status in ltsp package in Ubuntu: Won't Fix Status in ifupdown package in Debian: Fix Released Status in ltsp package in Debian: New Bug description: The unit /lib/systemd/system/ifup@.service is Debian and Ubuntu specific, it's not part of upstream systemd. On shutdown, it unconditionally ifdowns all interfaces: ExecStop=/sbin/ifdown %I This is a regression from previous init systems (sysvinit and upstart) which cared so that when a network file system was in use, they didn't ifdown the interfaces. Specifically, both /etc/init.d/networking and /etc/init/networking contain these functions: check_network_file_systems() check_network_swaps() which output the message "not deconfiguring network interfaces: network file systems still mounted" and exit. So, please call the same functions in the ExecStop= part of ifup@.service. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1492546/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp