@malin I suppose a smart phone does count as a second computer. idk why you would need to change the install material once you are at the point you have erased the old os. plus if you use ventoy there is no rewriting the USB you just copy the iso file on there and it works. the instructions are available for download and can be read in the install media. and GUI installers will generally tell you if you need to turn out secure boot. idk it seems like these are problems that were common years ago