The last days I was asked a lot, how and where to install the new QGIS 3.
Until now there are no Windows binaries available (as far as I know…). But you can install and run QGIS 3.0 on Linux.

If you are running Ubuntu 17.10 (artful) or even 18.04 (bionic) (beware, it’s still alpha 😉 ), it is quite easy to install:

Open your terminal and add the following repositories to your sources.list:

for 17.10:

sudo add-apt-repository "deb     https://qgis.org/debian artful main"
sudo add-apt-repository "deb-src https://qgis.org/debian artful main"

 

alternatively, for 18.04:

sudo add-apt-repository "deb     https://qgis.org/debian bionic main"
sudo add-apt-repository "deb-src https://qgis.org/debian bionic main"

 

Add public key:

wget -O - https://qgis.org/downloads/qgis-2017.gpg.key | gpg --import
gpg --fingerprint CAEB3DC3BDF7FB45
gpg --export --armor CAEB3DC3BDF7FB45 | sudo apt-key add -


Update and install QGIS:

sudo apt-get update && sudo apt-get install qgis python-qgis qgis-plugin-grass

Enjoy working with the all-new QGIS 3!

However, as soon as binaries for Windows are out, I would still recommend to use QGIS on Linux. In my opinion it runs a lot more stable and with less problems under Linux (which doesn’t mean it runs unstable under Windows…).