Similar error:
/etc/resolvconf/update.d/libc: Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf
It may indicate that the symbolic link “/etc/resolv.conf” is missing, in order to fix this, you can create it manually:
sudo ln -s /run/resolvconf/resolv.conf /etc/resolv.conf sudo resolvconf -u
Alternatively, run a “resolvconf” reconfiguration using the following command:
sudo dpkg-reconfigure resolvconf