Applications > Accessories > Terminal
$ sign means you are not root, I cannot update, install...
i type:
su
Password:
i type my password given at Debian installation
# sign, good, i am root
i check for updates
i type:
apt-get update && apt-get upgrade
or
apt-get clean && apt-get update && apt-get upgrade -y && apt-get dist-upgrade -y
i will now get Chromium for using with Google apps
i type:
apt-get install chromium
i will get Libre Office
i type:
apt get install libreoffice
i'll stop being root
i type:
exit
( i see the $ sign again)
i close Terminal
i type:
exit