By default network management on Ubuntu Core is handled by systemd's networkd and netplan. However, when NetworkManager is installed, it will take control of all networking devices in the system by creating a netplan configuration file in which it sets itself as the default network renderer.
So what you can do is visit Ubuntu Packages, from a machine that has Internet connectivity (friend's, work, etc.) go down to the bottom of the page, and download Network Manager that corresponds to your Ubuntu version and architecture (32, or 64 bit), (in my case its for 13.04 Raring) and once downloaded, take it over to your system, and Ubuntu Main amd64 Official network-manager_1.10.6-2ubuntu1_amd64.deb: network management framework (daemon and userspace tools) Ubuntu Main arm64 Official network-manager_1.10.6-2ubuntu1_arm64.deb rec: network-manager-gnome network management framework (GNOME frontend) or plasma-widget-networkmanagement Package not available or plasma-nm Plasma5 networkmanager library. rec: network-manager-pptp network management framework (PPTP plugin core) rec: ppp (>= 2.4.6) Package network-manager-config-connectivity-ubuntu bionic (18.04LTS) (net): NetworkManager configuration to enable connectivity checking 1.10.6-2ubuntu1.1 [ security ]: all Download network-manager_1.10.6-2ubuntu1_amd64.deb for 18.04 LTS from Ubuntu Main repository. The network installer is also useful if you want to install Ubuntu on a large number of computers at once. For 20.04 LTS, users can use the new Ubuntu Live installer to setup and configure a network install. Instructions for the 20.04 Ubuntu Live installer; Download the network installer for 18.04 LTS
Package network-manager-config-connectivity-ubuntu bionic (18.04LTS) (net): NetworkManager configuration to enable connectivity checking 1.10.6-2ubuntu1.1 [ security ]: all Download network-manager_1.10.6-2ubuntu1_amd64.deb for 18.04 LTS from Ubuntu Main repository.
Jul 14, 2020 · Introduction to NetworkManager NetworkManager is a set of co-operative tools that make networking simple and straightforward. Whether you use WiFi, wired, 3G, or Bluetooth, NetworkManager allows you to quickly move from one network to another: Once a network has been configured and joined once, it can be detected and re-joined automatically the next time it's available.
Today we will highlight the Xtreme Download Manager for Ubuntu, one of the best download managers has finally been released for Ubuntu 16.04, 17.04 and 17.10. It integreates perfectly with whatever browser you use and of course you can still use it via command line if you want to keep it old school.