I ran this command
lspci -knn | grep Net -A3; rfkill list
and it says
Hard blocked: yes
Anyway I am not able to get wifi on at all. I just switched from Windows to Ubuntu.
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Two possible problems here:
RFkill blocks device.
Hard blocked: yes line in your output above.
You can try to switch it
sudo rfkill unblock all.
Also make sure that you have turned on Wi-Fi hardware switch on the laptop itself.
Old driver issue. I do not believe in that as Ralink drivers are stable.
You can stay on 14.04 LTS but use newer kernel on it. While using Ethernet connection, install the 4.4 kernel from 16.04 LTS with
sudo apt-get install linux-image-generic-lts-xenial.