I am attempting to install/reinstall the Ubuntu/Linux OS onto my laptop but am running into a snag. I am booting from a USB drive and am having issues during the setup, specifically the Installation Type page. According to the directions online, it should be asking me if I want to erase and install the new program. Instead, the window I get is completely blank. If I click on the Install Now button, the message says "no root file system is defined. Please correct this partitioning menu.". I have made 3 boot USB drives, one for Ubuntu 18.06, Ubuntu 18.10, and Xubuntu 16.04. I have attempted to install each one but ran into the same exact problem every time. I don't know what it means and do not know what to do. Can someone please help me?
*Edit:. Went into G parted and took a screenshot.