I have installed ubuntu via a usb stick. I followed to the letter according to the official tutorial on the ubuntu main site. https://tutorials.ubuntu.com/tutorial/tutorial-install-ubuntu-desktop#0 everything went well as it should, but when i reboot my laptop, it gives me the error in the picture.
What can be the problem?
My laptop is acer e 15, and before i installed ubuntu, i had windows 10 professional.
Thanks for the help.
