Why isn't my desktop powering off with
What I did:
sudo -s systemctl poweroff
"reboot: system halted"
System: armbian (debian-10-buster on orangepiplus2e) 32-bit
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You have not said what hardware.
If a Raspberry Pi, then it does not have the hardware to turn off the power. It will do everything else, but can not remove the power (unless you add a power supply that can receive the message, and add the software to send it, and integrate it into the power-off software).
This is generally due to a buggy BIOS or issues with drivers.
You might try one of these :
updating your BIOS
updating your graphic card driver
disabling IRQs in the ACPI configuration (acpi=noirq)
fully disabling ACPI in the BIOS