Comment 22 for bug 1782709

Some more info:
 - The machine is a Virtualbox ubuntu bionic, and I have a snapshot before the upgrade, so I can reproduce it
 - I'm using ifconfig instead of netplan, because I need a ppp interface (for pppoe)
 - I have an /etc/network/interfaces file
 - it seems that the interface through which I'm using ssh loses it's IP address (defined in the interfaces file as static)
 - I also did these after installing bionic:
"systemctl disable systemd-networkd-wait-online.service
systemctl mask systemd-networkd-wait-online.service" because it was holding up the boot process for a long period