In the case of Astra linux:
If it is running on an Elbrus processor only the X86 instruction set is likely to be supported. There is no FPC back end for Linux compiled for Elbrus ISA, but there is for Linux compiled for Elbrus' X86 compatible ISA mode. In that case, install from apt. Both architectures are supported by Elbrus, but only the X86 version will work. Astra linux was developed specifically for the Elbrus.
See
https://en.wikipedia.org/wiki/Elbrus_2000 and
https://en.wikipedia.org/wiki/Astra_LinuxFPC should run on Astra linux for linux-x86_64 (also on Elbrus X86 mode) and ARM. The S390 and Elbrus_2000 instruction sets are not supported.
BTW: If somebody knows how to obtain an Elbrus 2000 based board in the Netherlands, I would be very interested, because of its security features, especially dynamic pointer validity verification.