Ubu-chroot invalid command

Hi, I’m trying to port sailfish OS on the galaxy tab a 10.1 from 2016, I’m stuck at the ubu-chroot part for the moment.
The command is invalid even though I did download and unpack the instructed way successfully except the sed part: can’t read /usr/bin/ubu-chroot: No such file or directory.
I’m running ArchLinux if that helps .