I completely removed my NetworkManager with all dependencies (and I have no idea what this includes). But I managed to reinstall my NetworkManager, to edit my interface file, an no have access to the internet by LAN (I have to execute dhclient manual form terminal.).
Is there a way to reinstall just the unknown removed default packages an stuff without overwriting my customized system (personal files, thunderbird, firefox, drivers, ...)? I have read about
sudo apt-get install ubuntu-minimal,
ubuntu-desktop, but I'm not sure which of these fits best or if there better ways (especially for Xubuntu).
Ubuntu 18.04.3 LTS
NetworkManager version: 1.10.6-2ubuntu1.1
Thanks to everybody!