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The simplest and most reliable method to download NDK r23b for Linux x86_64 is via Google’s official CDN:

The official SHA-1 for android-ndk-r23b-linux-x86_64.zip is:

If you don’t have wget (rare), use curl -O [URL] instead.

: "No toolchains found in the NDK toolchains folder for ABI with prefix: arm-linux-androideabi"

mv android-ndk-r23 ~/android-ndk-r23

Make sure the NDK binaries are executable: