So, I installed debian Jessie on my computer. And it does not have any desktop. I have used numerous of different commands but it just say cannot be found. Thanks for the help. EDIT! One way to fix my problem is using linux mint USB stick I have. But it does not boot it. I have other computer to use if needed. And at start bios I only have 1. Debian at the list.
You've probably done a minimal installation of Debian, without X Window (what you call "desktop"). As the root user, type this at the shell prompt:
apt-get install gnome
This will install GNOME on your machine.
If you prefer to install KDE instead:
apt-get install kde-full
Just for your information, this will add several hundreds of Mb of software on your machine. This is in no way a problem unless your Linux box is pretty tight in specifications.
EDIT: It looks like your network repositories are not configured. Edit your
/etc/apt/sources.list so it contain this:
deb http://httpredir.debian.org/debian jessie main deb-src http://httpredir.debian.org/debian jessie main deb http://httpredir.debian.org/debian jessie-updates main deb-src http://httpredir.debian.org/debian jessie-updates main deb http://security.debian.org/ jessie/updates main deb-src http://security.debian.org/ jessie/updates main