Thanks.
I made this sources.list file
deb http://ftp.us.debian.org/debian/ jessie main contrib
deb-src http://ftp.us.debian.org/debian/ jessie main contrib
deb http://security.debian.org/ jessie/updates main contrib
deb-src http://security.debian.org/ jessie/updates main contrib
# jessie-updates, previously known as 'volatile'
deb http://ftp.us.debian.org/debian/ jessie-updates main contrib
deb-src http://ftp.us.debian.org/debian/ jessie-updates main contrib
# jessie-backports, previously on backports.debian.org
# deb http://ftp.us.debian.org/debian/ jessie-backports main contrib non-free
# deb-src http://ftp.us.debian.org/debian/ jessie-backports main contrib
non-free
Then I could make a system update.
