Try adding the 32 bit arch packages first:
dpkg –add-architecture i386
Then update the sources
apt-get update
And install ferret
apt-get install ferret-sidejack:i386

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Yeah as mentioned in lecture 44 mitmf will work against websites that use normal https such as hotmail.com, the reason why it doesn’t work against HSTS websites is because modern browsers come with a list of websites that they can only browse as HTTPS, so even when we downgrade the connection to http the browser will just refuse to open that website.