Main:It seems like you have a conflict between Connman and NetworkManager.Connman often runs in the background, even if NetworkManager is active Try uninstalling Connman if you don’t need it: apt remove connman.Then check if /etc/resolv.conf is still being rewritten.Supplement:I had a similar issue after an upgrade.WiCD can also cause confusion if it was previously installedCheck what’s running: systemctl status NetworkManager.