Similar is not the same... Please start a new topic instead of hijacking one
Apparently only necessary for 64-bit target environment
Check date/ time of your Pi...E: Release file for http://archive.raspberrypi.org/debian/d ... /InRelease is not valid yet (invalid for another 58d 5h 16min 49s). Updates for this repository will not be applied.
The one flying on SSTL's Demonstration of Technology satellite (DoT-1) is the same set-up you would purchase on the High Street. SSTL spent £50.