Libre Computer Le Potato is a low cost ($35 on Amazon as of January 2023) Raspberry Pi clone, which is widely available.
It is fully open source and comes with many OS images, including latest Ubuntu LTS 22.04.

It does have some shortcomings comparing to Pi 4:
1. Lower speed, e.g. it takes 30s to plate solve an image vs 22s on RPi4
2. It only has USB2 and no USB3, but performance degradation was not noticeable even for 26MB IMX571 mono chip
3. Network is only 100MB and not 1GB, but performance degradation was not noticeable while using VNC
4. Even though Wifi is missing, it can be added using a USB dongle, which also has an advantage of having an external antenna
5. Missing Bluetooth is not a big loss for this use case
6. Even though this computer comes with only 2GB or RAM, it can still work with 26MB IMX571 mono chip by setting up swap space. No performance degradation was observed due to swapping

I updated my script for installing all astro software to support this board.
Script is available under github.com/avarakin/AstroPiMaker4 and instructions are at the end of the readme file.

Alex

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