Minecraft Pi Edition won't start?

I have installed the latest Ubuntu desktop version on my Raspberry Pi 4, and now wanted to install the Minecraft Pi Edition, I followed the instructions in the instructions, but when I entered./minecraft-pi the following error message came up (see screenshot)

How can I fix the problem?

Either there's no Mincraft-pi file in the folder look again otherwise try to make the file executable with "sudo chmod 755 mincraft-pi".

what does the command "ls" say what kind of files are in the folder?

So in the Minecraft-Pi (mcpi) folder there's already a file called minecraft-pi…

What are the attributes of this file? Is it practicable? Have you carried out the command above?

sudo chmod + x. / minecraft-pi

I entered it, does not work, there's no message in the console…

i get the same message, dont know why