Cat /etc/apt/sources.list

# deb cdrom:[Debian GNU/Linux 8.8.0 _Jessie_ - Official i386 lxde-CD Binary-1 20170506-12:51]/ jessie main 

# deb cdrom:[Debian GNU/Linux 8.8.0 _Jessie_ - Official i386 lxde-CD Binary-1 20170506-12:51]/ jessie main 

deb http://ftp.de.debian.org/debian/ jessie main 
deb-src http://ftp.de.debian.org/debian/ jessie main 

deb http://security.debian.org/ jessie/updates main 
deb-src http://security.debian.org/ jessie/updates main 

# jessie-updates, previously known as 'volatile'
deb http://ftp.de.debian.org/debian/ jessie-updates main 
deb-src http://ftp.de.debian.org/debian/ jessie-updates main 



deb http://ftp.de.debian.org/debian/ stable-updates non-free contrib main  

deb http://httpredir.debian.org/debian jessie-backports main contrib non-free