Ubuntu / Debian - add or remove used architecture by apt and dpkg (x86, x64, armhf, arm64, etc.)

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sudo dpkg --add-architecture ARCHITECTURE_NAME_HERE
sudo dpkg --remove-architecture ARCHITECTURE_NAME_HERE
sudo apt update


# Practical examples:
#
sudo dpkg --add-architecture i386
sudo dpkg --remove-architecture armhf
sudo apt update


# Example architectures:
#
#     i386               32-bit x86 architecture
#     amd64              64-bit x86 architecture
#     armhf              32-bit ARM architecture (with floating point instructions)
#     arm64              64-bit ARM architecture
#     mips64el, ppc64el  other architectures for RISC and PowerPC based systems
#
#     etc.