I know that this question has been asked before, but none of the solutions have solved my problem.
Ubuntu boots and runs properly with the USB I used to install it plugged in to the computer, but when I shut down, remove the USB, and reboot, Windows Boot Manager appears. I am very confused why my computer wants anything to do with Windows because I chose to wipe my drive when installing Ubunbu.
I have tried using Boot-Repair, but Windows Boot Manager still launched when I restarted without the USB. Here is the log from Boot-Repair.