Solve Sourcelist Problems with Resolv.conf OpenDNS
Add OpenDNS Nameservers to resolv.conf
This has solved problems seemingly unique to some service provides
sudo vi /etc/resolv.conf
Replace existing IPv4 addresses with openDNS nameservers or just add them above the existing IPs in your resolv.conf
208.67.222.220
208.67.220.222
Same for IPv6 addresses
2620:0:ccc::2
2620:0:ccd::2
also add to end – as last line
options rotate
Restart Networking
sudo service networking restart
Reference
OpenDNS Nameservers