$ sudo apt update
$ sudo apt install gnome-software
$ sudo vi /etc/apt/sources.list
# Add these sources
deb http://kali.download/kali/ kali-rolling main non-free contrib
deb http://ftp.debian.org/debian stable main contrib non-free
deb http://http.kali.org/kali kali-rolling main non-free contrib
deb http://http.kali.org/kali kali-last-snapshot main non-free contrib
deb http://http.kali.org/kali kali-experimental main non-free contrib
deb-src http://http.kali.org/kali kali-rolling main non-free contrib