Install Node.js:
sudo apt-get install nodejs

nodejs -v

Install nvm
sudo apt-get update
Install** c++ compiler*. It may already exists, but just in case.*
sudo apt-get install build-essential libssl-dev

Install nvm

sudo apt install curl
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.34.0/install.sh | bash

Reload bash
source ~/.bashrc

After installation close and reopen terminal and check nvm version
nvm --version
Install node
Install latest node
nvm install node

Set default node version for nvm
nvm alias default node

Check version of node and npm
node -v
npm -v

npm install -g react-native-cli

Install Java jdk
sudo apt install openjdk-8-jre openjdk-8-jdk

java -version
javac -version

Configure build path in your .bashrc

sudo nano /home/mohammed/.bashrc

export ANDROID_HOME=$HOME/Android/Sdk
export PATH=$PATH:$ANDROID_HOME/tools
export PATH=$PATH:$ANDROID_HOME/tools/bin
export PATH=$PATH:$ANDROID_HOME/platform-tools
export PATH=$PATH:$ANDROID_HOME/emulator

Reload bash
source ~/.bashrc

echo $ANDROID_HOME

out
/home/mohammed/Android/Sdk

Trouble shooting with permission
sudo apt install qemu-kvm
sudo adduser mohammed kvm
sudo chown mohammed /dev/kvm

install watchman
sudo apt install git

git clone https://github.com/facebook/watchman.git
cd watchman/
git checkout v4.7.0
sudo apt-get install -y autoconf automake build-essential python-dev
./autogen.sh
./configure
make

error this step

./configure --enable-lenient
sudo make install
watchman –version

# 4.7.0

Creating a Sample application

npx react-native init SampleProject

Run React Native App
cd SampleProject

mkdir android/app/src/main/assets

go to file “ node_modules/metro-config/src/defaults/blacklist.js “

var sharedBlacklist = [ /node_modules[/\]react[/\]dist[/\]./, /website/node_modules/./, /heapCapture/bundle.js/, /./tests/./ ];

react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res

npm install
npm start - --reset-cache

 Finally, run the app using this command

npx react-native run-android
error watchmanResponse: {
version: '4.7.0',
error: 'A non-recoverable condition has triggered. Watchman needs your help!\n' +

echo 256 | sudo tee -a /proc/sys/fs/inotify/max_user_instances
echo 32768 | sudo tee -a /proc/sys/fs/inotify/max_queued_events
echo 65536 | sudo tee -a /proc/sys/fs/inotify/max_user_watches
watchman shutdown-server

npx react-native start

i finded solution. I did sudo pkill -9 -x fseventsd and then run command react-native start with sudo. sudo react-native start

Fix Error when running watchman
Error watchmanResponse version: '4.7.0', error: 'A non-recoverable condition has triggered. Watchman needs your help!\n' +

echo 256 | sudo tee -a /proc/sys/fs/inotify/max_user_instances
echo 32768 | sudo tee -a /proc/sys/fs/inotify/max_queued_events
echo 65536 | sudo tee -a /proc/sys/fs/inotify/max_user_watches

watchman shutdown-server