Всё правильно???

#
# deb cdrom:[Debian GNU/Linux 8 _Jessie_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150425-13:55]/ jessie main
#deb cdrom:[Debian GNU/Linux 8 _Jessie_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150425-13:55]/ jessie main
deb http://ftp.ru.debian.org/debian/ jessie main non-free contrib
deb-src http://ftp.ru.debian.org/debian/ jessie main non-free contrib
deb http://security.debian.org/ jessie/updates main contrib non-free
deb-src http://security.debian.org/ jessie/updates main contrib non-free
# jessie-updates, previously known as 'volatile'
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