Chromecast works just fine with my desktop linux having chromium installed as explained here How can I use Chromecast .
Is it possible to use it with ubuntu touch? My phone is a BQ Aquaris E4.5
Chromium seems not to be in the app store.
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up.Sign up to join this community
Currently, on most of the devices, it's not supported to do so, and there is no way to install and enable the Cast extension in the Ubuntu Browser.
However, you can set up a Libertine container and install Chromium in it, with the Terminal app or over ssh/adb:
$: libertine-container-manager create --id xenial --name 'Chromium' $: libertine-container-manager install-package -i xenial -p chromium-browser
Then, install the Desktop Apps Scope from the store, and it should show Chromium to launch. You should then be able to install the Cast extension in it. Note though, the E4.5 is very limited in CPU and RAM, and so you may not actually be able to run Chromium reliably enough for this purpose on that device.