How Can I position my GuiTexture on the same position in every screen resolution ?
Thank you
You can use GUIMatrix
scale it to a native resolution. The only downside is that in groups gui pivots get messed, so avoid rotations in groups.
Search for gui scaling matrix
If you’re talking about actual GUITexture objects, they use viewport space so are already positioned the same on every resolution, as long as you avoid using the pixel inset for positioning.
–Eric
There is example for this ? 
Eric I had try it but also if I not use pixel inset the GuiTexture are not in the same position If I use smartphone with different screen resolution…
Ah ok ok I don’t want it ! I want that the guiTexture is at the same position BUT from left border ! If I put the guibutton into the bottom angle on the left I want that if I change the screen resolution it stay there !
I am also having a similar problem and I am still searching for a perfect way to do this, for me I am using the Penelope dual Joysticks in both corners of the screen.
I have not used pixel inset and have used the transform in the inspector to get the position on the screen for my dual sticks, and I have just used this code to try and fix the scaling/stretching problem. Now I need to make it so the Joysticks actually work again, it seems like the Penelope ones almost rely on the Pixel inset value.
http://www.devination.com/2014/01/unity-gui-tutorial-scale-gui-to-right.html