Disable Alt+ buttons for keyboard layout (Logitech):
sudo dpkg-reconfigure keyboard-configurationDisable Alt+Shift in Window keyboard settings:

Install tweak tool and change layout buttons:
sudo apt-get install gnome-tweak-tool
Disable Alt+ buttons for keyboard layout (Logitech):
sudo dpkg-reconfigure keyboard-configuration
Disable Alt+Shift in Window keyboard settings:

Install tweak tool and change layout buttons:
sudo apt-get install gnome-tweak-tool