Hi. I have a Jetson Xavier NX Devkit. I used the SD Card Image method to install ubuntu 20.4 on this DevKit. When I want to connect the NX to the monitor, the nvidia logo appears, but then the “_” sign flashes in the upper left corner of the screen. I can use the terminal, but it doesn’t come with any desktop interface. Can you help with this?
Ubuntu 20.04 corresponds to L4T R35.x. You can find various software related to flash and operation here:
https://developer.nvidia.com/linux-tegra
On a developer’s kit which does not have eMMC, and in which the SD card is mounted to the module and not to the carrier board, only the o/s is on the SD card. Jetsons do not have an actual BIOS, but that content’s equivalent is located in the QSPI memory of the module itself, along with the bootloader and other boot-related code. This code is necessary before the SD card can actually be reached and run. If you’ve flashed any L4T R35.x non-o/s content to the module itself, then it should boot. Most likely you’ve not flashed that content (flashing it once should be sufficient for most any SD card with L4T R35.x).
You’ll need to flash the actual Jetson (not the SD card) with that content using an Ubuntu host PC. I think Ubuntu 20.04 or 22.04 should work for flashing with JetPack/SDK Manager. Note that JetPack/SDKM is just the GUI front end to the actual flash software, and that what actually gets flashed is L4T. In turn, L4T is just what you’d call Ubuntu once you’ve added NVIDIA content to it. Jetsons don’t have an actual BIOS, and so you must use that host PC to flash.
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