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I like to use ''[https://wiki.debian.org/resolv.conf resolvconf]'' to allow me to make persistent modification to my ''resolv.conf'' file to do things like [https://steamforge.net/wiki/index.php/How_to_configure_OpenVPN_to_resolve_local_DNS_%26_hostnames#OpenVPN_Client_Setup allow OpenVPN to resolve local DNS hostnames]. In the past (mostly on [https://linuxmint.com/ Linux Mint] machines I've simply installed ''resolvconf'', and after doing so, no issues were induced related to how my machine connects to the internet, resolves hostnames, etc. Well on [https://releases.ubuntu.com/18.04/ Ubuntu 18.04] after installing ''resolvconf'' my machine could no longer resolve hostnames (that is to say I could ping IP address but I couldn't ping host names or visit websites using their standard text based web address). The problem appears to be that the ''resolv.conf'' file was no longer getting a DNS nameserver from the DHCP server upon connecting to a network.
[https://forums.linuxmint.com/viewtopic.php?t=131369 This thread] helped me find the solution, which is fairly simple. Apparently the issue is unique to Ubuntu and was implemented by the Ubuntu team to fix some problems with multiple name servers present when using VPN and LAN connections simultaneously. Regardless, you can "fix" the issue caused by installing ''resolvconf'' on Ubuntu 18.04 (and likely other versions) by editingdoing the following. #Edit ''NetworkManager.conf'' by running <pre>sudo nano /etc/NetworkManager/NetworkManager.conf</pre> #Comment out the line that reads ''dns=dnsmasq'' or ''dns=default'' (or probably ''dns=<anything>'' by prepending it with a '''#'''. Your file should look something like this when it's done<pre>[main]#dns=defaultplugins=ifupdown,keyfile [ifupdown]managed=false [device]wifi.scan-rand-mac-address=no</pre> #Restart your computer and you should now be automatically getting a DNS nameserver from the DHCP server when you connect to a network. This means you should be able to ping hostnames and browse the internet as expected even with ''resolvconf'' installed.
