I found out, that networking there is only broken due to a bug in the apparmor
settings, you can fix this by
sudo apt install apparmour-utils
sudo aa-complain /etc/apparmor.d/sbin.dhclient
Then everything runs fine
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https://bugs.launchpad.net/bugs/1700657
Title:
Touchpad not detected in Lenovo X1 Yoga / Yoga 720-15IKB
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