Unable to instal packages in ubuntu subsystem in windows 10

  apt-get, ubuntu, windows

I tried to install in the terminal using:

sudo apt-get install packagename

and I get

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package numpy

I already checked this tutorial "https://itsfoss.com/unable-to-locate-package-error-ubuntu/" and it didn’t help (probably ’cause it is not meant for ubuntu in windows).

Source: Windows Questions