The first stage is to load Ubuntu from the USB, if you already load and install Ubuntu - skip it and go to stage 2.
1. First you just need to ensure the BIOS is set to UEFI, disable "Legacy option ROMS" and enable secure boot (Secure boot is optional). (Figures 1 - 3)
2. Save the changes and turn off the computer.
3. connect the USB.
4. Restart the computer and press the F12 key several times
5. The boot menu will appear, use the arrows on your keyboard to choose the USB Flash Drive and press Entre.
5a. If you are unable to load the Boot menu please visit this page: https://www.linuxartists.com/help-support/dell?c=how-to-boot-from-our-usb-flash-drives.
6 After Ubuntu deskop appear double click on the installation Icon, and follow the instructions on the scree. To see how to install Ubuntu along side Windows please see this page: https://www.linuxartists.com/help-support/install-ubuntu-18-alongside-windows?c=support-for-ubuntu.
1. Once the UBUNTU install from the USB key is finished and you reboot the system, Press F2 when you see the Dell logo to enter the BIOS. Once in the BIOS choose Boot Sequence.
2. In the boot sequence screen that pops up click on the Add Boot Option button. The Add Boot Option window will pop up. Type a name in the Boot Option Name text area (Ubuntu for example). Click the button to the left of the File Name text area. The EFI Boot Selection window will pop up. (Figure 4)
3. In the File System drop down menu choose "FS0:". Then using the Directories section, navigate until you can choose SHIMx64.EFI file in the Files section. (Figures 5 - 7)
4. Type a name in the Boot Option Name text area (Ubuntu for example). Click OK. Click Apply. (Figure 8)
5. Exit the BIOS and you should now be able to boot to UBUNTU normally from the boot drive.