Randomize is don't work

Question

I want to create a random dungeon generation, and I noticed that randi(), rand_range() and randi_range() always return the same numbers. For example: if I use var x = randi() % 15 it's always return a 8.
I had used randomize() before this in _ready() function. And I have Ubuntu 21.04

Comments

Godot version 3.2.2.stable.official

Godot 3.2.x is not supported anymore. Please upgrade to 3.3.2 :)

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I had updated to 3.3.2 and problem is still

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var rng = RandomNumberGenerator.new()

func _ready():
    rng.randomize()
    for i in range(10):
        var _x = randi() % 15
        print(_x)

Everytime different number. Godot 3.3.2

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I created a test project, added a node 2d and paste your code. Every time I run the program I have the same numbers:14, 0, 12, 0, 4,12, 8, 3, 3, 2
Maybe it's problem with my Ubuntu?

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var _x = rng.randi() % 15

Instead of

var _x = randi() % 15

My mistake

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it helped, thanks!