error Failed to launch emulator. Reason: No emulators found as an output of `emulator -list-avds`, I've added an avg in android studio manually also - react-native

Question

I'm new to react native and trying to install it and facing this problems, I've tried many fixes but they don't work.
full error- npx react-native run-android
info Running jetifier to migrate libraries to AndroidX. You can disable it using "--no-jetifier" flag.
Jetifier found 936 file(s) to forward-jetify. Using 4 workers...
info JS server already running.
/bin/sh: 1: adb: not found
info Launching emulator...
error Failed to launch emulator. Reason: No emulators found as an output of `emulator -list-avds`.
warn Please launch an emulator manually or connect a device. Otherwise app may fail to launch.
info Installing the app...
> Configure project :app
Unable to detect AGP versions for included builds. All projects in the build should use the same AGP version. Class name for the included build object: org.gradle.composite.internal.DefaultIncludedBuild$IncludedBuildImpl_Decorated.
This version only understands SDK XML versions up to 2 but an SDK XML file of version 3 was encountered. This can happen if you use versions of Android Studio and the command-line tools that were released at different times.
unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}layoutlib>,<{}api-level>
unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}layoutlib>,<{}api-level>
unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}api-level>
unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}api-level>
unexpected element (uri:"", local:"base-extension"). Expected elements are <{}vendor>,<{}codename>,<{}abi>,<{}api-level>,<{}tag>
unexpected element (uri:"", local:"base-extension"). Expected elements are <{}vendor>,<{}codename>,<{}abi>,<{}api-level>,<{}tag>
unexpected element (uri:"", local:"base-extension"). Expected elements are <{}vendor>,<{}codename>,<{}abi>,<{}api-level>,<{}tag>
unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}layoutlib>,<{}api-level>
unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}layoutlib>,<{}api-level>
Errors limit exceeded. To receive all errors set com.sun.xml.bind logger to FINEST level.
unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}api-level>
Checking the license for package Android SDK Tools in /home/t/Android/Sdk/licenses
License for package Android SDK Tools accepted.
Preparing "Install Android SDK Tools (revision: 26.1.1)".
"Install Android SDK Tools (revision: 26.1.1)" ready.
Installing Android SDK Tools in /home/tannu/Android/Sdk/tools
"Install Android SDK Tools (revision: 26.1.1)" complete.
"Install Android SDK Tools (revision: 26.1.1)" finished.
Checking the license for package Android SDK Build-Tools 30.0.2 in /home/tannu/Android/Sdk/licenses
License for package Android SDK Build-Tools 30.0.2 accepted.
Preparing "Install Android SDK Build-Tools 30.0.2 (revision: 30.0.2)".
"Install Android SDK Build-Tools 30.0.2 (revision: 30.0.2)" ready.
Installing Android SDK Build-Tools 30.0.2 in /home/t/Android/Sdk/build-tools/30.0.2
"Install Android SDK Build-Tools 30.0.2 (revision: 30.0.2)" complete.
"Install Android SDK Build-Tools 30.0.2 (revision: 30.0.2)" finished.
Checking the license for package Android SDK Platform 31 in /home/t/Android/Sdk/licenses
License for package Android SDK Platform 31 accepted.
Preparing "Install Android SDK Platform 31 (revision: 1)".
"Install Android SDK Platform 31 (revision: 1)" ready.
Installing Android SDK Platform 31 in /home/t/Android/Sdk/platforms/android-31
"Install Android SDK Platform 31 (revision: 1)" complete.
"Install Android SDK Platform 31 (revision: 1)" finished.
> Task :app:compileDebugJavaWithJavac
> Task :app:stripDebugDebugSymbols
Unable to strip the following libraries, packaging them as they are: libbutter.so, libc++_shared.so, libevent-2.1.so, libevent_core-2.1.so, libevent_extra-2.1.so, libfabricjni.so, libfb.so, libfbjni.so, libflipper.so, libfolly_futures.so, libfolly_json.so, libglog.so, libglog_init.so, libimagepipeline.so, libjsc.so, libjscexecutor.so, libjsi.so, libjsijniprofiler.so, libjsinspector.so, liblogger.so, libmapbufferjni.so, libnative-filters.so, libnative-imagetranscoder.so, libreact_codegen_rncore.so, libreact_config.so, libreact_debug.so, libreact_nativemodule_core.so, libreact_render_animations.so, libreact_render_attributedstring.so, libreact_render_componentregistry.so, libreact_render_core.so, libreact_render_debug.so, libreact_render_graphics.so, libreact_render_imagemanager.so, libreact_render_leakchecker.so, libreact_render_mapbuffer.so, libreact_render_mounting.so, libreact_render_runtimescheduler.so, libreact_render_scheduler.so, libreact_render_telemetry.so, libreact_render_templateprocessor.so, libreact_render_textlayoutmanager.so, libreact_render_uimanager.so, libreact_utils.so, libreactnativeblob.so, libreactnativejni.so, libreactnativeutilsjni.so, libreactperfloggerjni.so, librrc_image.so, librrc_root.so, librrc_text.so, librrc_unimplementedview.so, librrc_view.so, libruntimeexecutor.so, libturbomodulejsijni.so, libyoga.so.
> Task :app:installDebug
> Task :app:installDebug FAILED
37 actionable tasks: 31 executed, 6 up-to-date
Note: /home/t/quizApp/android/app/src/debug/java/com/quizapp/ReactNativeFlipper.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
[adb]: * daemon not running; starting now at tcp:5037
[adb]: * daemon started successfully
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:installDebug'.
> com.android.builder.testing.api.DeviceException: No connected devices!
* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 3m 13s
error Failed to install the app. Make sure you have an Android emulator running or a device connected.
Error: Command failed: ./gradlew app:installDebug -PreactNativeDevServerPort=8081
Note: /home/t/quizApp/android/app/src/debug/java/com/quizapp/ReactNativeFlipper.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
[adb]: * daemon not running; starting now at tcp:5037
[adb]: * daemon started successfully
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:installDebug'.
> com.android.builder.testing.api.DeviceException: No connected devices!
* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 3m 13s
at makeError (/home/tannu/quizApp/node_modules/#react-native-community/cli-platform-android/node_modules/execa/index.js:174:9)
at /home/t/quizApp/node_modules/#react-native-community/cli-platform-android/node_modules/execa/index.js:278:16
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at async runOnAllDevices (/home/tannu/quizApp/node_modules/#react-native-community/cli-platform-android/build/commands/runAndroid/runOnAllDevices.js:109:5)
at async Command.handleAction (/home/t/quizApp/node_modules/#react-native-community/cli/build/index.js:192:9)
info Run CLI with --verbose flag for more details.