During a travel through China I have been using expressVPN with Ubuntu 16.04 After uninstalling it, I could not use internet connections anymore. My /etc/resolv.conf looks like this
# Generated by expressvpn search expressvpn nameserver 10.19.0.1
and I made sure to have a working internet connection as described here: https://askubuntu.com/questions/790745/connected-to-wifi-but-no-internet/790770
ssh and scp do work. http, mail protocols don't.
How can I remove expressvpn configurations? I am not able to gain write access to /etc/resolv.conf even with root priviledges. Thank you for your help.
Edit: The immutable bit was set.