En una instalación limpia colocar
vi /etc/apt/sources.list
###### Repositorios oficiales ##########
deb http://ftp.us.debian.org/debian/ stretch main contrib non-free
deb-src http://ftp.us.debian.org/debian/ stretch main contrib non-free
# stretch-actualizaciones-seguridad
deb http://security.debian.org/debian-security stretch/updates main contrib non-free
deb-src http://security.debian.org/debian-security stretch/updates main contrib non-free
# stretch-actualizaciones-sistema
deb http://mirrors.kernel.org/debian/ stretch-updates main contrib non-free
deb-src http://mirrors.kernel.org/debian/ stretch-updates main contrib non-free
deb http://mirrors.kernel.org/debian stretch-proposed-updates main contrib non-free
deb-src http://mirrors.kernel.org/debian stretch-proposed-updates main contrib non-free
#Dropbox
deb http://download.virtualbox.org/virtualbox/debian stretch contrib
apt-get install aptitude
vi /etc/default/grub
modificar GRUB_TIMEOUT=0 //esta en 5
update-grub2
wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
aptitude install kgpg blueman virtualbox-5.2 keepass2 dia pgadmin3 youtube-dl cups rhythmbox thunar-dropbox-plugin testdisk apache2 php7.0 php7.0-ldap php7.0-pgsql postgresql-9.6 pdftk libmp3splt0 libmp3splt0-mp3 texlive-latex-base texlive-latex-extra texlive-latex-recommended texlive-fonts-recommended texmaker anyremote ganyremote wmctrl dia pgadmin3 gedit unrar-free unrar syslinux python-glade2 gedit unrar firmware-realtek gnome-calculator ttf-mscorefonts-installer git brasero gparted ssh dnsutils audacity calibre g++ vim zim locate kid3 gimagereader glabels meld
para crear usb booteable
dpkg -i dpkg -i live-usb-install-2.5.11-all.deb
gpasswd -a tu_usuario vboxusers
cd /etc/udev/rules.d/
cp 60-vboxdrv.rules 60-vboxdrv.rules.original
vi 60-vboxdrv.rules
reboot