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Thanks for your time and sorry both for my english and for my lack in computer skills. I have an HP PAVILION G6 notebook that works with Windows 8. Yesterday I tried to install Lubuntu 18.04 alongside Windows (dual boot) but I probably did it in the wrong way: first of all, GRUB doesn't show automatically and to reach it I have to enter the Bios Device Options with F9 and choose Notebook Hard Drive. I tried to "fix" that with Boot-Repair using the Linux Terminal but when I run the Recommended Repair the program shows this error:
"The current session is in Legacy mode. Please reboot the computer, and use this software in an EFI session. This will enable this feature. For example, use a live-USB of Boot-Repair-Disk-64bit (www.sourceforge.net/p/boot-repair-cd), after making sure your BIOS is set up to boot USB in EFI mode."
So I found out that while Windows 8 works in UEFI mode, Lubuntu works in Legacy/Bios mode. I have no idea how to resolve this so I've decided to unistall Lubuntu but I'm not able to do that since I found disinstallation tutorials that concern only Ubuntu UEFI mode.
I know that there are a lot of topics similar to this one but I still didn't find anything that could help me. I just want to unistall Lubuntu and do the installation once again in the correct way.