Step1:

Check if  /etc/resolv.conf  file is empty or lacking permissions

if it’s empty: create the file,

sudo nano /etc/resolv.conf

Then add,

nameserver (your default gateway ip)

If you don’t know what your default gateway is type in,

ip r | grep default

Or, simply add  nameserver 8.8.8.8  and save the file

Restart network manager,

service network-manager restart  for old distros

sudo service NetworkManager restart  for new distros

If your /etc/resolv.conf is lacking permissions, type in  chmod o+r /etc/resolv.conf  or delete that file and create a new one.

Still having issues follow step2

Step2:

Check if your NetworkManager.service is masked.

For new distros,

systemctl list-unit-files | grep NetworkManager.service

For old distros,

systemctl list-unit-files | grep network-manager.service

look for  masked  within the output

if NetworkManager.service is masked then unmasking it will eventually remove the service from the  /etc/systemd/system  directory.

So, It’s better not to unmask it. else installing the  network-manager  package will fix it.

First we gotta enable the internet access from terminal. Type in.

dhclient Your-Interface-Name

dhclient eth0  for example. If you only have WIFI as a resource and don’t have the GUI thing set up, follow connect wifi from terminal then type in  dhclient wlan0

Finally, install the  network manager  package and restart the service

For new distros,

sudo apt install network-manager
sudo service NetworkManager restart
sudo service NetworkManager status

For old distros,

sudo apt install network-manager
sudo service network-manager restart
sudo service network-manager status

To install the GUI,  sudo apt install network-manager-gnome . To open it type in  nm-connection-editor  from terminal.

And, this should fix your issue 🙂