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+## Building Cesium for Ubuntu
+
+Ionic allow to build native unbuntu application. Using the `click` tool, and the Cordova `ubuntu` platform.
+
+## Install Ubuntu SDK 
+
+Source documentation [here](https://developer.ubuntu.com/en/phone/platform/sdk/installing-the-sdk/) and [here](https://cordova.apache.org/docs/en/latest/guide/platforms/ubuntu/index.html)
+
+Install SDK :
+
+```bash
+sudo add-apt-repository ppa:ubuntu-sdk-team/ppa
+sudo apt update
+sudo apt install ubuntu-sdk
+```
+
+Install "click" packaging and dev tools:
+
+```bash
+sudo apt-get install click cmake libicu-dev pkg-config devscripts qtbase5-dev qtchooser qtdeclarative5-dev qtfeedback5-dev qtlocation5-dev qtmultimedia5-dev qtpim5-dev libqt5sensors5-dev qtsystems5-dev 
+
+```
+> ou alternativement (à tester) : 
+> `sudo click chroot -a armhf -f ubuntu-sdk-15.04 install cmake libicu-dev:armhf pkg-config qtbase5-dev:armhf qtchooser qtdeclarative5-dev:armhf qtfeedback5-dev:armhf qtlocation5-dev:armhf qtmultimedia5-dev:armhf qtpim5-dev:armhf libqt5sensors5-dev:armhf qtsystems5-dev:armhf`
+
+
+
+## Add Ubuntu platform to Ionic project
+
+```bash
+cd cesium
+ionic platform add ubuntu
+```
+
+## Running Ubuntu SDK IDE (optional)
+ 
+To be able to launch Ubuntu SDK IDE, make sure your user has the unix group 'lxd'. 
+ 
+`sudo usermod -a -G lxd mon_user`
+
+Then launch the command `ubuntu-sdk-ide &` 
+
+## Build Debian package (.deb)
+
+Generate the `click` source code:
+
+```bash
+cd cesium
+ionic build ubuntu --release
+```
+
+Then build the DEB package:
+ 
+```bash
+cd platforms/ubuntu/native/fr.duniter.cesium
+debuild
+```
+
+This should generate `.deb` and description files. 
+
+> This step requires a valid GPG key, to sign the `.deb` file.
+
+
+### Testing on an Ubuntu phone
+
+```bash
+cd cesium
+ionic run ubuntu --device
+```
+
+## Publishing to Ubuntu App Store
+
+Follow steps on https://developer.ubuntu.com/en/publish/
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