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Internet access is available for a brief second when the browser is initiated, but after a split second, internet connection is unavailable.

Searching a bit in the forum, I found out that

dpkg-reconfigure resolvconf and service network-manager restart

resolved the problem temporaly, needed to be done after every boot.

This happended after running xflock4 with the shortcut CTRL+ALT+L. The screen went black for a minute, then became red. Without response, I powered-off the machine manually. Is there a permanent fix?

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1) You shouldn't manually update your resolv.conf, because all changes will be overwritten by data that your local DHCP server provides. If you want it to be static, run sudo dpkg-reconfigure resolvconf and answer "no" to dynamic updates. If you want to add new entries there, edit /etc/resolvconf/resolv.conf.d/base and run sudo resolvconf -u, it will append your entries and DHCP server's entries.

2) Try to edit your /etc/network/interfaces and add your entries there, like

auto eth0 iface eth0 inet dhcp dns-search google.com dns-nameservers dnsserverip and then restart /etc/init.d/networking restart or sudo ifdown -a and sudo ifup -a

3) Your system uses udhcp which is a very small DHCP client program. The udhcp client negotiates a lease with the DHCP server and notifies a set of scripts when a leases is obtained or lost. You can read about it's usage here or just edit this script (as you did).

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  • This was a bigger hassle then I expected. I ended up reinstalling the system in the end. Thank you for your kind response, Mayur, but I couldn't fix it, sadly.
    – NiltonB
    Jan 5, 2019 at 20:34
  • but sometimes we have a large backup then reinstallation is the big challenge.
    – Mayur Bhandare
    Jan 7, 2019 at 6:54

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