[SOLVED]Problem with Ubuntu Scaling

[khofo]

Hey guys,
I have a problem with my Ubuntu VM, there seems to be a problem with scaling since when it's in a small window the resolution is good although when I switch to full screen or large window the screen is stretched I had the same problem with Kali before perhaps bcz both are Debian ?
Here is pictures I don't know if it's clear:

Stretched above



(normal above)


I am not sure u can see the actual difference but it's very annoying in full screen :(

[proxx]

Did you install guest additions?

[khofo]

Did you install guest additions?

U were quite quick replying and yes just realized I didn't. I feel really bad about it now :p
I think I should kill myself. Anws thanks for reminding me and now Ubuntu works like a charm.
Mucho Gracias