cubie@cubieboard2:~$ cat /etc/apt/sources.list
deb http://httpredir.debian.org/debian/ jessie non-free contrib main  
deb-src http://httpredir.debian.org/debian/ jessie main contrib non-free 

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

#deb http://ftp.ru.debian.org/debian/ jessie non-free contrib main  
#deb-src http://ftp.ru.debian.org/debian/ jessie main contrib non-free 

#deb http://ftp.ru.debian.org/debian/ jessie-updates main contrib non-free 
#deb-src http://ftp.ru.debian.org/debian/ jessie-updates main contrib non-free 

# security packages come always from main repository
deb http://security.debian.org/ jessie/updates main contrib non-free 
deb-src http://security.debian.org/ jessie/updates main contrib non-free 

deb http://ftp.ru.debian.org/debian/ jessie-backports main