Matlab on Linux - Failed to load module "appmenu-gtk-module"

I installed Matlab R2021b on Ubuntu 20.04.3 and i am unable to open the app just by running it normally with "matlab" command in terminal or by oppening it mannualy from the folder where i installed it.

When i get it to run in terminal this is what i get :

"MATLAB is selecting SOFTWARE OPENGL rendering.

Gtk-Message: 23:28:11.640: Failed to load module "appmenu-gtk-module"

(MATLAB:6256): Gtk-WARNING **: 23:28:11.673: Unable to locate theme engine in module_path: "adwaita",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.673: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.681: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.682: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.683: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.683: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.683: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.685: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.685: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.685: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.686: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.686: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.687: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.687: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.688: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.688: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.689: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.689: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.689: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.690: Unable to locate theme engine in module_path: "murrine",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.692: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.693: Unable to locate theme engine in module_path: "adwaita",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.694: Unable to locate theme engine in module_path: "pixmap",

(MATLAB:6256): Gtk-WARNING **: 23:28:11.694: Unable to locate theme engine in module_path: "murrine",

MESA-LOADER: failed to open iris: /usr/lib/dri/iris_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/x86_64-linux-gnu/dri:\$${ORIGIN}/dri:/usr/lib/dri)

failed to load driver: iris

MESA-LOADER: failed to open kms_swrast: /usr/lib/dri/kms_swrast_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/x86_64-linux-gnu/dri:\$${ORIGIN}/dri:/usr/lib/dri)

failed to load driver: kms_swrast

MESA-LOADER: failed to open swrast: /usr/lib/dri/swrast_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/x86_64-linux-gnu/dri:\$${ORIGIN}/dri:/usr/lib/dri)

failed to load swrast driver"

After all this warning messages and the Mesa-Loader ones the app oppens but i still don't know if it works 100%.

Does anyone has a solution for this?

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/472134-gtk-message-10-32-31-466-failed-to-load-module-canberra-gtk-module#comment_821063