eth0 cant fetch IP

[bluemanos]

Without running the command sudo netplan apply after every startup, the eth0 cant get IP address.

Adding the sudo netplan apply to /etc/rc.local didnt fix the issue :/

PS.
Configured wlan0 interface works perfectly.

[bluemanos]

Temporary solution:

Put in crontab below script to run every minute. As root user of course ;)

#!/bin/bash

IPADDR=`/bin/ip addr show eth0 | grep "inet\b" | awk '{print $2}' | cut -d/ -f1`

#echo "IPADDR: [$IPADDR]";

if [ "$IPADDR" == "" ]
then
	#echo "Running the 'netplan apply' command"
	netplan apply
fi

[AbelCS]

If I check with: journalctl --no-pager -lu systemd-networkd

I can see this:

Nov 16 13:43:47 ubuntu systemd[1]: Starting Network Service...
Nov 16 13:43:47 ubuntu systemd-networkd[1455]: wlan0: Gained IPv6LL
Nov 16 13:43:47 ubuntu systemd-networkd[1455]: Enumeration completed
Nov 16 13:43:47 ubuntu systemd-networkd[1455]: eth0: Could not find udev device: No such device
Nov 16 13:43:47 ubuntu systemd-networkd[1455]: eth0: Failed
Nov 16 13:43:47 ubuntu systemd-networkd[1455]: Could not add new link, ignoring: No such device
Nov 16 13:43:47 ubuntu systemd[1]: Started Network Service.

I think it could be realted to: https://bugs.launchpad.net/ubuntu/+source/netplan.io/+bug/1770082

[AbelCS]

The problem seems fixed in newer netplan releases, so this should be fixed in a future Ubuntu (armhf) update.

Meanhwile, adding @reboot /usr/sbin/netplan apply to root crontab (sudo crontab -e) is working for me. Can you try and confirm if this workaround is ok for you too?

[thekev]

@reboot cron workaround is effective for me.