[Bug 1771236] [NEW] forced use of systemd-networkd interferes with ifupdown in 18.04

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For several reasons, we are not able to use netplan nor systemd-networkd
due to legacy applications that expect ifupdown's pre-up and post-up
script mechanism.  The documentation around 18.04's (premature, I feel)
wholesale adoption of netplan claims that one can revert to old
behaviour by merely installing ifupdown (amongst assertions that netplan
will never offer a mechanism for configuring pre-up and post-up actions
even for network managers that support them).

However when ifupdown is installed, systemd-networkd still tries to
manage interfaces.  If you 'systemctl disable systemd-networkd', upon
next reboot it is automatically re-enabled.  We tried disabling any
systemd units even remotely related to networking and yet systemd-
networkd still runs.  If it hasn't been configured, it tries to DHCP.
On networks that don't provide DHCP this results in a stupendously long
stall during boot.  Currently it appears to be impossible to tell
systemd-networkd not to run in a clean manner that won't get reverted on
package upgrades.

I sincerely hope this is is a bug/oversight and not intentional.  We
need to be able to disable systemd-networkd properly.

Thanks

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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forced use of systemd-networkd interferes with ifupdown in 18.04
https://bugs.launchpad.net/bugs/1771236
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