Installation Knime Analytics Plattform 4.7.3 on Linux Laptop

Hello Everybody,
I am working with Knime in my job on a Windows machine. Now I want to use
Knime on my privat Linux laptop (Linux Mint 18.3). However after downloading
and unpacking of the knime_4.7.3 Linux package, the knime executable file is not
recognizied as such. Do you have any idea what goes wrong or how to
circumvent this. Also, to my surprise, it is not possible to install knime
via the “sudo apt-get install” command in the Terminal i.e. CLI shell (error message: the
knime package cannot be found). Thank you in advance!
Armin Alois