[ubuntu] DNS gone after reboot

Problem

After a fresh installation of kubuntu 22.04 LTS, DNS does not work any longer after a reboot (or shotdown and start).

Solution

Most robust

Edit (possibly create) a file within /etc/systemd/network/. It might be called like 10-dhcp.network, however, it should contain:

[Match]
# Naming scheme: en* -> ethernet, wlan* -> wlan
Name=*

[Network]
DHCP=yes

If you want, you can create for each technology one file. Then you need to restart your network by:

sudo systemctl restart systemd-networkd

Less robust because of static

Make sure that in /etc/systemd/resolved.conf the is an uncommented line

DNS=192.168.2.1 208.67.222.222 208.67.220.220 192.168.1.1

where the ip addresses are the ones of the DNS servers you want to use.

Alternatively

You can configure the DNS servers in each of your network configuration with the network manager of your system or your choice.

Holzhammermethode

sudo ln -sf "/run/systemd/resolve/stub-resolv.conf" "/etc/resolv.conf"