Based on your answer that there wasn't a boot partition, your report that the display doesn't work, and an experiment that I've just conducted, I suspect that UNetbootin doesn't do a proper job of installing Raspbian.

Since you're just getting started, please try this: Get a copy of balenaEtcher and use it to re-flash your microSD card. Try the boot process again, with display and keyboard connected, and see what happens. Etcher will take the .img file which you may already have extracted, but you can feed it the .zip file as downloaded from the Raspberry Pi Foundation, too. It will uncompress on the fly.

Once you have keyboard, display, and mouse working, you can then easily set up headless operation if you like.

The experiment was to flash an SD card using UNetBootin (Windows, not Linux, though) then try to boot a Pi 4. I got no display, red light on, a repeating sequence of four flashes on the green LED. According to this link the four flashes can mean one of a few things. In this case, it is an utterly unreadable SD card.

Based on your answer that there wasn't a boot partition, your report that the display doesn't work, and an experiment that I've just conducted, I suspect that UNetbootin doesn't do a proper job of installing Raspbian.

Since you're just getting started, please try this: Get a copy of balenaEtcher and use it to re-flash your microSD card. Try the boot process again, with display and keyboard connected, and see what happens. Etcher will take the .img file which you may already have extracted, but you can feed it the .zip file as downloaded from the Raspberry Pi Foundation, too. It will uncompress on the fly.

Using Etcher is the path of least resistance, but if you don't want to or can't install it, you can flash the image using dd. The Raspberry Pi Foundation has instructions.

Once you have keyboard, display, and mouse working, you can then easily set up headless operation if you like.

The experiment was to flash an SD card using UNetBootin (Windows, not Linux, though) then try to boot a Pi 4. I got no display, red light on, a repeating sequence of four flashes on the green LED. According to this link the four flashes can mean one of a few things. In this case, it is an utterly unreadable SD card.

Based on your answer that there wasn't a boot partition, your report that the display doesn't work, and an experiment that I've just conducted, I suspect that UNerbootin doesn't do a proper job of installing Raspbian.

Since you're just getting started, please try this: Get a copy of balenaEtcher and use it to re-flash your microSD card. Try the boot process again, with display and keyboard connected, and see what happens. Etcher will take either the .img file which you may already have extracted, but you can feed it the .zip file as downloaded from the Raspberry Pi Foundation, too. It will uncompress on the fly.

Once you have keyboard, display, and mouse working, you can then easily set up headless operation if you like.

Based on your answer that there wasn't a boot partition, your report that the display doesn't work, and an experiment that I've just conducted, I suspect that UNetbootin doesn't do a proper job of installing Raspbian.

Since you're just getting started, please try this: Get a copy of balenaEtcher and use it to re-flash your microSD card. Try the boot process again, with display and keyboard connected, and see what happens. Etcher will take the .img file which you may already have extracted, but you can feed it the .zip file as downloaded from the Raspberry Pi Foundation, too. It will uncompress on the fly.

Once you have keyboard, display, and mouse working, you can then easily set up headless operation if you like.

The experiment was to flash an SD card using UNetBootin (Windows, not Linux, though) then try to boot a Pi 4. I got no display, red light on, a repeating sequence of four flashes on the green LED. According to this link the four flashes can mean one of a few things. In this case, it is an utterly unreadable SD card.