'erreur upload image php

I have the following error:

Warning: move_uploaded_file(avatar/essai.jpg): failed to open stream:
... Permission not granted in /opt/lampp/htdocs/site/submitfunc.php ...

Warning: move_uploaded_file(): Unable to move '/opt/lampp/temp/php2FwMbY' to 'avatar/essai.jpg' in /opt/lampp/htdocs/site/submitfunc.php on line 3

when I press confirm to load the image

Here is my function submitfunc.php:

<?php
//la fonction qui va changer l'image de profil
//function that will change the profile picture
move_uploaded_file($avatar_tmp,'avatar/'.$avatar);
mysql_query("

UPDATE membres SET avatar='{$_FILES['avatar']['name']}' WHERE nom='{$_SESSION['nom']}'

");

?>

I use xampp on ubuntu

phpfile-uploaduploadxampp


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