Problem: You updated your Ubuntu and the wif‌i button is not working on your Dell Laptop but you need the internet. L‘
Solution: Fix it. Follow these steps.
Note: (Change the Red Text to your preference)

First…
1. Open a Terminal and enter the following.
rfkill list

2. Look for numbers 0 and 1
Example:
0: phyO: Wireless LAN
Soft blocked: no
Hard blocked: yes
1: i24OOm-usb12-1 .521 .0: WiMAX
Soft blocked: yes
Hard blocked: no

3. In the Terminal enter the following.
rfkill unblock 0
then
rfkill unblock 1