so I got an imac 6,1 from my uncle, its running ios snow leapard and also booting up xubuntu. I have 1 small problem and that is when i try to do pretty much anything but sit on the desktop it freezes and i have to restart the machine, ive tried reinstalling 3 times and it hasnt worked, when installing it freezes at downloading additional languages. ive also tried lubuntu multiple times and it always gives me a grub error. Im using a modified 64-bit xubuntu 18.04 iso that i burned to a disk using simply burn, im also using rEFit. The ram was upgraded to 8 gb, any help would be appreciated