The Ubuntu 17.04 distribution is not connecting to Internet, not in a live USB session, nor after the install. I've got a Dell Inspiron 24-7459. This is a major issue as I cannot update or download anything. Without the possibility of connecting to the Internet I'm completely stuck.
I've followed the instructions on this thread and nothing changes:
Can't connect to wifi on Ubuntu 17.04
In my case it's not a question of WIFI only. The Internet is not working even under the wired connection.
Solved!
Go to System settings/Network/Wired/Options and then choose the enp4s0 option. It worked for me.
I had the case where I could connect to WiFi but couldn't access webpages due to DNS-related errors. This resolved it for me:
Ubuntu 17.04 systemd-resolved DNS lookups randomly fail
Ubuntu 17.04 can not resolve DNS servers with DNSSEC support as of 2017-04-18. Disable DNSSEC with this daemon:
sudo mkdir -p /etc/systemd/resolved.conf.d printf "[Resolve]\nDNSSEC=no\n" | sudo tee /etc/systemd/resolved.conf.d/no-dnssec.conf
Optionally reconfigure resolvconf if you messed with it (say yes to "prepare /etc/resolve.conf for dynamic updates?"):
sudo dpkg-reconfigure resolvconf
Restart systemd-resolved:
sudo systemctl restart systemd-resolved
Your DNS should start working. You can check by trying systemd-resolve www.google.com and seeing a response.
