Somehow after an upgrade I started getting this issue. After the bootup, the wireless would show as disabled. Then, I found the following in a forum which helped me
execute
vikas@vikas-laptop:~$ rfkill list all
0: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
1: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
You should see both the soft(ware) blocked and hard(ware) blocked as no. If either of them is yes then the connection would not be enabled. To enable do the following
vikas@vikas-laptop:~$ rfkill unblock wifi
At least mine got working after this!
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