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gsettings set com.canonical.Unity.Lenses remote-content-search none; if [ `cat /etc/lsb-release | grep DISTRIB_RELEASE | cut -d"=" -f2` \< '13.10' ]; then sudo apt-get remove -y unity-lens-shopping; else gsettings set com.canonical.Unity.Lenses disabled-scopes "['more_suggestions-amazon.scope', 'more_suggestions-u1ms.scope', 'more_suggestions-populartracks.scope', 'music-musicstore.scope', 'more_suggestions-ebay.scope', 'more_suggestions-ubuntushop.scope', 'more_suggestions-skimlinks.scope']"; fi; sudo sh -c 'echo "127.0.0.1 productsearch.ubuntu.com" >> /etc/hosts';

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What does this do?
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gsettings set com.canonical.Unity.Lenses remote-content-search none 	
        Turns off "Remote Search", so search terms in Dash don't get sent to the internet

gsettings set com.canonical.Unity.Lenses disabled-scopes "['more_suggestions-amazon.scope', 'more_suggestions-u1ms.scope', 'more_suggestions-populartracks.scope', 'music-musicstore.scope', 'more_suggestions-ebay.scope', 'more_suggestions-ubuntushop.scope', 'more_suggestions-skimlinks.scope']"
        Turns off other remote Dash scopes, just in case (for Ubuntu 13.10 and newer)

sudo apt-get remove -y unity-lens-shopping 	
        Uninstalls Amazon ads built-in to Ubuntu (for Ubuntu 13.04 and older)
    
sudo sh -c 'echo "127.0.0.1 productsearch.ubuntu.com" >> /etc/hosts' 	
        Blocks connections to Ubuntu's ad server, just in case