With TPMfOSd 126.96.36.199, how to you enable the 64-bit Linux deployment engine?
With TPMfOSd 188.8.131.52, to enable the 64-bit Linux deployment engine, you need to create a new Deployment Scheme.
In the GUI, select OS Deployment > Deployment schemes.
Edit the "Network settings", setting the following field to YES,
"Use Linux Deployment Engine x86-64 when applicable."
Note that the default setting is "NO".
With this scheme, every deployment of a system profile, cloned from a reference machine that has Linux with OS arch = x86-64, will use the LinuxDE x86-64.