sieder

import React, { useEffect, useState } from 'react'
import { View, Text, FlatList, StyleSheet, TouchableOpacity, Button, Image } from 'react-native'

import { SliderBox } from 'react-native-image-slider-box'

const fetchJson = async (url) => {
    const response = await fetch(url)
    const json = await response.json()
    //  data = await json
    console.log(json)

sieder

The following signatures couldn't be verified because the public key is not available: NO_PUBKEY [duplicate]
Solution : sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 23E7166788B63E1E

adduser user_name
usermod -aG sudo user_name