Hi @Mezmoin and welcome.
Which Teracube Teracube 2e “zirconia” or Teracube 2e “emerald” ?
You might look on your PC for the log Howto troubleshoot issues with the easy-installer and read that or share it here.
Perhaps you could clarify whether you attempted to “help Easy Installer along” manually ? and what happened ?
In many cases where Easy Installer fails, and the user has confidence to use a “manual install method” this can be the best way forward.
This Teracube 2e emerald post may give insight as to why you should be sure to start the manual install from a fully working device.