Oh, ok. I'm not familiar with Linux, but I found a page on getting Scratch for Linux to install on a 64-bit system.
Scratch on Linux wrote:
Scratchers have reported good results forcing the installation of the package on their 64 bit systems with the following command:
sudo dpkg --force-architecture -i ./scratch_1.4.0.1-0ubuntuX_i386.deb
(Replace X with the version number of the package you are installing)
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