Macbuntu script is safe, but in the fact it runs with root privileges and this is already becoming a dangerous.
Macbuntu does not contain any malicious code, as it guarantees. I guarantee the safe code only if the application comes from this address
I do not put this package in any other place outside the https://sourceforge.net/projects/macbuntu/files/
Remember, check whether a link leads to this page. Otherwise, stop downloading.
This is your computer and take care of him, never run applications with root privileges if you do not trust the software or you are unsure about the origin of this software.
It is very possible that soon I will prepare a PPA for Macbuntu, until then keep checking the origin of the package.
Thank you for your attention, have fun :)