Ubuntu 16.04 LTS dual boot installing error


I have a laptop that I dual booted (preloaded with Windows ten) with Ubuntu 16.04 LTS using wubi (no USB or CD).

Trying to install anbox, but it gets to a point and gets stuck:

Media change: please insert the disc labeled ‘Ubuntu 16.04.2 LTS Xenial Xerus - Release amd64 (20170215.2)’ in the drive ‘/media/cdrom/’ and press [Enter]

This is a 2-in-1 laptop so there is no CD-Rom drive. Please help!