How run Netflix on Ubuntu-xfce-bionic_Linux-4.9

Hi, I’m trying to run Netflix and Youtube on Chromium in Ubuntu-xfce-bionic_Linux-4.9 in VIM1 Pro. First I tried to install chromium-widevine from but I got stuck for missing makepkg -sri (no command found). I didn’t find how to install this command. Then I tried to install it as instructed in but again I got stuck in the error ‘/etc/portage/package.use: No such file or directory’. Is there any other way to enable Chromium to run Netflix and Youtube and Popcorn? Or Is there any way to install Chome ou Firefox in Ubuntu-xfce-bionic_Linux-4.9 in VIM1?