DNS not working after upgrade 17.04 to 17.10

I was updating Ubuntu today form version 16.10 through 17.04 to 17.10. For me too DNS stopped working. The resolv.conf symlink was

/etc/resolv.conf -> /run/NetworkManager/resolv.conf

This is apparently wrong for 17.10. The error message the previous poster got is from the output of resolvconf -service:

$ systemctl status resolvconf

It gave the following output.

resolvconf[623]: /etc/resolvconf/update.d/libc: Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf

By removing the original symlink, linking to /run/resolvconf/resolv.conf to /etc/resolv.conf and restarting the resolvconf -service DNS began working again:

$ sudo rm /etc/resolv.conf
$ sudo ln -s /run/resolvconf/resolv.conf /etc/resolv.conf
$ systemctl restart resolvconf

Interestingly the exit code of the resolvconf-service was success even before the symlink was pointing towards the correct file.

I found this bug reported here: https://bugs.launchpad.net/ubuntu/+source/resolvconf/+bug/1725840; please confirm that you also suffering from it. It is resolved through a simple dpkg-reconfigure resolvconf.

I ran into the same issue and saw this looking at resolvconf

Oct 20 00:36:17 drew-8570w resolvconf[708]: /etc/resolvconf/update.d/libc: Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf

Recreating the symlink fixed it. Now using 127.0.0.53 by default now?

$ ls -al /etc/resolv.conf 
lrwxrwxrwx 1 root drew 27 Apr  6  2017 /etc/resolv.conf -> /run/resolvconf/resolv.conf
$ cat /etc/resolv.conf 
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.

nameserver 127.0.0.53