Could not launch emulator in Android Studio

I tried to launch application in emulator in android Studio in ubuntu 14.04 and it shows the following errors.

1. Error shown while gradle build is in process:

/home/next/NTE/MachineSetup/android-sdk-linux/tools/emulator -netdelay none -netspeed full -avd Nexus_5X_API_24 Could not launch '/home/next/NTE/MachineSetup/android-sdk-linux/tools/qemu/linux-x86/qemu-system-x86_64': No such file or directory

2. Error appear after gradle build completed:

12/02 16:47:57: Launching app Error while waiting for device: The emulator process for AVD Nexus_5X_API_24 was killed.

I have attached screenshots for your reference.

The first error's reason is below:

There are two emulators: one in $SDK/tools, another one in $SDK/emulator.
The one in $SDK/tools cannot start.

Please place $SDK/emulator before $SDK/tools in your $PATH variable, it should fix the problem.

I'm using Android Studio 2.3: edit file : .profile

export ANDROID_HOME=${HOME}/Library/Android/sdk

export PATH=${PATH}:${ANDROID_HOME}/emulator

before

export PATH=${PATH}:${ANDROID_HOME}/tools

Like:

Not sure if this will help for you but I was seeing this error trying to run emulator in the console. I changes the ANDROID_SDK to point to the bin folder in my .bash_profile and that corrected the issue

export ANDROID_HOME=~/Library/Android/sdk

export ANDROID_SDK=$ANDROID_HOME/lib

1: add $SDK/emulator in your $PATH variable
2: remove $SDK/tools in your $PATH variable
3: adb kill-server
4: adb start-server
5: Start the emulator from the command line

Example:
emulator @Pixel_XL_API_23

It may be Android Emulator is not installed.

To add it to the Android Studio installation, go to Tools->Android->SDK Manager, select the SDK Tools tab, then ensure that Android Emulator is selected.