How to use ASCII characters on KDE?

1-Go to

System settings->Input devices->Keyboard->Advanced->Position of the compose key

2-Choose a option available, like Right Control
3-Test it typing

Righ_Control =  c

4-You get

€ 

Arcam Sapientia

This is the equivalent to the Alt on Windows systems.

How to change the keyboard layout for the console (Ctrl+Alt+F1)?

1-Go to the console

Press Control+Alt+F1, for example

2-Install the console-common package

sudo apt-get install console-common

3-Follow the instructions and choose your new keyboard layout
4-Test the new layout

 Arcam Sapientia

 To reconfigure your keybout layout run

sudo dpkg-reconfigure console-common

This tip is useful to us keyboard for foreign users.Users that have pipeline (|) missing can emulate it using this tip too.