This is in file etc/netplan/00-installer-config.yaml (enp0s5 is
configured with DHCP4, but real NIC is enp0s4...)
#####
# This is the network config written by 'subiquity'
network:
ethernets:
enp0s5:
dhcp4: true
version: 2
#####
This is visible in output from "sudo journalctl":
...
Jun 05 02:53:44 t2004 kernel: virtio_net virtio1 enp0s4: renamed from eth0
...
Jun 05 02:53:53 t2004 systemd-resolved[718]: Using system hostname 't2004'.
Jun 05 02:53:53 t2004 systemd[1]: Started Network Name Resolution.
Jun 05 02:53:53 t2004 systemd[1]: Reached target Network.
Jun 05 02:53:53 t2004 systemd[1]: Reached target Host and Network Name Lookups.
Jun 05 02:53:54 t2004 cloud-init[727]: Cloud-init v. 20.1-10-g71af48df-0ubuntu5
running 'init' at Fri, 05 Jun 2020 02:53:53 +0000. Up 15.84 seconds.
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info: +++++++++++++++++++++++++++Net
device info++++++++++++++++++++++++++++
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info:
+--------+-------+-----------+-----------+-------+-------------------+
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info: | Device | Up | Address |
Mask | Scope | Hw-Address |
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info:
+--------+-------+-----------+-----------+-------+-------------------+
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info: | enp0s4 | False | . |
. | . | 00:a0:98:4f:5d:d5 |
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info: | lo | True | 127.0.0.1 |
255.0.0.0 | host | . |
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info: | lo | True | ::1/128 |
. | host | . |
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info:
+--------+-------+-----------+-----------+-------+-------------------+
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info: +++++++++++++++++++Route IPv6
info+++++++++++++++++++
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info:
+-------+-------------+---------+-----------+-------+
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info: | Route | Destination | Gateway
| Interface | Flags |
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info:
+-------+-------------+---------+-----------+-------+
Jun 05 02:53:54 t2004 cloud-init[727]: ci-info:
+-------+-------------+---------+-----------+-------+
...
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1881832
Title:
Ubuntu server 20.04 fails to get IP address from DHCP server (no
network connectivity)
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https://bugs.launchpad.net/ubuntu/+source/netplan.io/+bug/1881832/+subscriptions
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