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unzip android-ndk-r23c-linux-x86_64.zip -d ~/Android/
export PATH=$PATH:~/Android/android-ndk-r23c

Always download from the official Google repository or Android Studio to avoid tampered binaries.

Direct download URL (as historically provided by Google):

https://dl.google.com/android/repository/android-ndk-r23b-linux-x86_64.zip

NDK r23b represents a critical transition point. It was the last major release to fully support: download androidndkr23blinuxx8664zip top

$ANDROID_NDK_HOME/build/tools/make_standalone_toolchain.py \
    --arch arm64 --api 21 --install-dir ~/my-toolchain

If you are behind a restrictive firewall, use Google’s secondary cache:

https://redirector.gvt1.com/edgedl/android/repository/android-ndk-r23b-linux-x86_64.zip

To use the NDK from anywhere, add it to your PATH. Open your shell configuration file (~/.bashrc, ~/.zshrc, or ~/.profile). unzip android-ndk-r23c-linux-x86_64

nano ~/.bashrc

Add these lines at the end:

export ANDROID_NDK_HOME=/opt/android-ndk-r23b
export PATH=$PATH:$ANDROID_NDK_HOME

Save, then reload:

source ~/.bashrc

Solution: Your disk may be full or have bad sectors. Check free space:

df -h /opt

Ensure at least 2.5GB free.

However, if you need Android API 31+ or the latest CMake features, consider r25 or r26.