Can't install Ubuntu 20.04 on ASUS Tuf a15 (ACPI?)

It looks like you need to pass the nomodeset parameter to the Linux kernel. If GRUB works and the menu appears, select the menu entry for Ubuntu (probably the first one) and press e . An editor screen will appear, then find the line starting with linux (just ignore whitespaces), then go to the end of the line and append nomodeset to the line. Now press Ctrl + x or F10 to boot. It should boot properly. After it successfully boots, we need to make these changes permanent. To do that, open a terminal window and execute the following:

gedit admin:///etc/default/grub

After the Text Editor window opens, it will prompt for your password (maybe twice), enter your password (not root password), you'll see the file contents. Find the line starting with GRUB_CMDLINE_LINUX_DEFAULT= and add nomodeset to the value like this:

// Taken from my /etc/default/grub file
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"

After you are done, save it and exit. Then execute the following in the terminal:

sudo update-grub

You can restart your PC and everything will be fine. :)

Try this one. Connect your TV or another monitor via HDMI cable and see if the picture goes there while you are having a black screen. If it does then you can go to display settings and activate your main monitor.