I recently got a used Inspiron machine that came with Windows 7. For some reason, it won't boot to windows successfully, only to Recovery. I found the license key underneath the laptop, so I tried re-installing Windows 7. That didn't work because it didn't recognize a way to install the system partition.
So I went to Ubuntu. I have an 8GB Flash drive with Ubuntu 18.04 LTS on it. I also have an available MacBook air. I successfully booted from the USB on the MacBook, but for some reason, I get this message when booting to the USB on the Inspiron. I get this error message:
An operating system wasn't found. Try disconnecting any drives that don't contain an operating system. Press any key to restart
There are 2 USB 3.0 ports, which do not recognize the USB drive, a regular USB port, and a USB/eSATA port. I usually use the USB/eSATA port when booting from other sources.
P.S. - I know I got the correct iso... I needed 64-Bit so I got 64-bit.