FIX installing & slow updating packages in Kali Linux 100% Working

Open terminal and write

nano /etc/apt/sources.list

And then Replace all text with this

# deb cdrom:[Debian GNU/Linux 7.0 _Kali_ - Official Snapshot i386 LIVE/INSTALL $

# deb cdrom:[Debian GNU/Linux 7.0 _Kali_ - Official Snapshot i386 LIVE/INSTALL $

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

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

## Security updates
deb http://http.kali.org/ /kali main contrib non-free
deb http://http.kali.org/ /wheezy main contrib non-free
deb http://http.kali.org/kali kali-dev main contrib non-free
deb http://http.kali.org/kali kali-dev main/debian-installer
deb-src http://http.kali.org/kali kali-dev main contrib non-free
deb http://http.kali.org/kali kali main contrib non-free
deb http://http.kali.org/kali kali main/debian-installer
deb-src http://http.kali.org/kali kali main contrib non-free
deb http://security.kali.org/kali-security kali/updates main contrib non-free
deb-src http://security.kali.org/kali-security kali/updates main contrib non-fr$

Then ctrl+x
Press y
Press enter

Open terminal and write 

sudo apt-get upgrade

Press enter

Then enter this

sudo apt-get update

Press enter