At the end of the install you still have a file in /etc/netplan. Did you also remove that? That could definitely explain the delay, as the installer wrote config for you (with how you configured the interface in the installer), and that config will be attempted at boot.
** Changed in: netplan.io (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1789119 Title: conversion from netplan to ifupdown broken To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/netplan.io/+bug/1789119/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs