sudo gedit /etc/apt/sources.list

Code:

#

# deb cdrom:[Debian GNU/Linux 2.0 _Sana_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150811-08:02]/ sana contrib main non-free

#deb cdrom:[Debian GNU/Linux 2.0 _Sana_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150811-08:02]/ sana contrib main non-free

deb http://security.kali.org/kali-security/ sana/updates main contrib non-free
deb-src http://security.kali.org/kali-security/ sana/updates main contrib non-free

deb-src http://http.kali.org/kali sana main non-free contrib
deb-src http://security.kali.org/kali-security sana/updates main contrib non-free

deb http://http.kali.org/kali sana main non-free contrib

deb http://http.kali.org/kali kali main contrib non-free
deb http://security.kali.org/kali-security kali/updates main contrib non-free

deb http://repository.spotify.com stable non-free
and

sudo apt-get install linux-headers-$(uname -r)