Reboot [partition] doesn't work

[Dasmaeht]

Hi,
I'm trying to setup my Raspbi with Raspbian, LibreELEC and Lakka. Since it is placed in my Living-Room, I don't have Keyboard & Mouse connected and am using it via VNC.
So, in order to change the distribution, I would have to reboot it via VNC and select the distribution at that time, because I don't have control in NOOBS.
I found this solution ( viewtopic.php?t=71107 ), which seems to be outdated.
Then I found this one ( viewtopic.php?t=196094 ) using

sudo reboot [partition],

but that doesnt't work. LibreElec is located on partition 8 ( which I found out that way https://www.instructables.com/id/Contro ... -/#discuss ), but whatever number I enter after reboot, the raspberry always boots into Raspbian. The solution posted there doesn't help, because I don't want to change the default boot-partition, but only want to be able to start LibreELEC out of raspbian.

systemctl reboot [partition]

as mentioned here (viewtopic.php?f=91&t=266092&p=1617010&h ... n#p1617010) doesn't work either; I guess it's the same command anyway?

What am I doing wrong here? I'm totally new to this and don't have any idea at the moment. :-/

Thanks i advance,
Best regards.

[ejolson]

I don't know. I just ran into this problem as well. It used to work, but not anymore. I suspect something has changed, but I don't see where it is documented.

Edit: I found it. There is a mysterious option that needs to be added to cmdline.txt for this to work on the Raspberry Pi 4B. More information is at

viewtopic.php?f=36&t=274553#p1664609

[procount]

You can control PINN via vnc. Use the 'vncshare' option.
NOOBS can use VNC with the vncinstall option,but it means it will ONLY display to VNC (not the HDMI output), whereas PINN's vncshare will output simultaneously to HDMI and VNC.

PINN can also be controlled via your TV remote (most) if it supports CEC.