How to remove the litle arrow on the Main Gnome Menu

Ok, open your terminal and follow the instructions:

First, let's download the package

sudo apt-get source gnome-panel

sudo apt-get build-dep gnome-panel

Then edit the applicable file (change "your_login_name" with your login name actually)

sudo gedit /home/(your_login_name)/gnome-panel-2.30.0/gnome-panel/panel-menu-button.c

find the word "has-arrow" (CTRL + F)
change the value "TRUE" to "FALSE" then save and exit :D


Re-open your terminal again and type

cd /home/(your_login_name)/gnome-panel-2.30.0/
sudo ./configure
sudo make
sudo make install

So, finally restart your gnome panel

killall gnome-panel

Hope, helpful.