Public bug reported:
After upgrading from 16.04 to 18.04, when I boot with an ethernet cable
connected, Ubuntu prefers to use the wifi interface over the ethernet
interface. Wifi is assigned the normal metric of 600 for both of its
routing table entries. However ethernet is assigned a metric of 20100.
I edited the connection details via nmcli to manually set the ethernet
metric to 100. After a reboot, the link route (for the LAN subnet)
correctly has a metric of 100. But the default route for eth0 is still
20100.
nm-applet shows the wifi icon, correctly indicating that the default
route is over wifi rather than ethernet. The only fix is to manually set
the route after every reboot, or turn off wifi. This is a regression
from 16.04.
network-manager 1.10.6-2ubuntu1
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1788659
Title:
network manager assigns ethernet default route metric of 20100
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