First thing we need to know is what wireless card is in that machine.
Go to a terminal and type the following
Also runs this script in a terminal and copy and past the resulting txt file which will be saved in your home folder.
it give valuable information about your wireless connections.
Code:
wget -N -t 5 -T 10 https://github.com/UbuntuForums/wireless-info/raw/master/wireless-info && \
chmod +x wireless-info && \
./wireless-info
(Just copy and past it into a terminal and hit enter , it will ask you for your password)
good Luck
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