OS: Debian 8.6->testing
As I can't custom the WIFI DNS on Debian, I thought there are something wrong for network-manager & its settings. So, I uninstalled it with
sudo apt remove network-manager
sudo apt autoremove
It's really stupid to do it from current viewpoint as you are offline after then. You can't reinstall them from repository. 😣 Even I plugged the wired, no way.
After google, I used the 'dpkg' command to recover the network-manager from Debian archives as following:
sudo dpkg -i /var/cache/apt/archives/network-manager*.deb
After that, Debian prompts lack of dependency about libndp0 & libteamdct10. So, install them first with dpkg command:
sudo dpkg -i /var/cache/apt/archives/libndp*.deb
sudo dpkg -i /var/cache/apt/archives/libteamdct*.deb
Finally, repeat dpkg for network-manager*.deb, the problem solved. No need to reinstall.😂
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