I think the OP means to install the AMAZON ALEXA Hub application suite or equivalent controlling software that is available for the Mac, Windows, and Android platforms on the Ubuntu system, probably with Indicator and Notification support included as well.
- Solution Zero
Install the Amazon Alexa App on your Android phone / Apple handset and keep your eyes peeled for projects on Linux for proposed Ubuntu Integration.
- Solution One
Go to the Snapcraft Snapd Store -
https://snapcraft.io/anbox-installer .
Copy and paste the following into your terminal and install Anbox:
sudo snap install anbox-installer --classic
or
sudo snap install --devmode --beta anbox
Enter your password, this will install the Android version on your Ubuntu system, then you are good to go!
More instructions here:
https://github.com/anbox/anbox/blob/master/docs/install.md
- Solution Two
Install WINE (again add it as a Snap or look in the Software Center for availability) to get the Windows version to work and run it from there.
It may give you different functionality to the Android version .
- Solution Three
Do it Yourself
http://events17.linuxfoundation.org/sites/events/files/slides/Echo_Compatible_Linux_Device_Anderson.pdf
- Solution Four
Install Chrome and use their Assistant through their Web Browser and your webcam, then return the Alexa unit back for a refund.
Rinse and repeat the same question but for Google HOME!
Results may vary.