Create ubuntu_network.md

ubuntu_network.md

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+# NetworkManager
+
+- `nm-applet` to run old GUI and activate `Enable Networking`.
+
+- `nm-connection-editor` to edit any weird configuration in the connections.
+
+- You can also see what the **NetworkManager** is doing with these commands.
+```bash
+# Run one by one to see if anything is useful
+nmcli device
+
+nmcli
+
+nmcli device show
+```
+
+if your network device says `unmanaged`, it means **NetworkManager** will not try to use that device to connect.
+
+---
+
+# Netplan
+
+```bash
+# Create a config file
+sudo nano /etc/netplan/ethernet.yaml
+```
+and enter this
+```bash
+network:
+  version: 2
+  renderer: networkd
+  ethernets:
+    eno1:
+      dhcp4: true
+```
+replace `eno1` with whatever your device is (mine was `ens33`).
+To see your list of devices, run `ip addr`.
+
+Finally apply the new configurations
+
+    sudo netplan apply