I upgraded my laptop to new Ubuntu distribution 17.10 this afternoon/evening and since then I cannot connect to the internet.
I have tried both wired and wireless connections, but the icon in the status bar shows a question mark over the connection icon whichever method I've tried. I originally thought it was a wireless problem (it's a Realtek RTL8833EE card) so tried to connect via Ethernet to download the latest driver but find I can't connect with wire either.
I had a similar problem last week with 17.04 which I resolved somehow but I can't find exactly what I did.
Please can I have some suggestions as to what I should try to troubleshoot.
EDIT: I have tried the question (and the answer) here:
both by adding a line
under /etc/NetworkManager/NetworkManager.conf, and by checking the resolvconf.service via
$ systemctl status resolvconf
which is NOT showing an error like
resolvconf: /etc/resolvconf/update.d/libc: Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf
I have confirmed that /etc/resolv.conf is a symbolic link to /run/resolvconf/resolv.conf