I’ve just installed Lubuntu 14.04 on my laptop (replacing the previous dual boot Ubuntu 13.10 / Windows 7, which my poor little laptop really didn’t have the space for). As part of the installation process, I was asked to select my keyboard layout. I selected Irish, and double-checked that the problematic keys (", @, €) worked correctly. Everything seemed fine.
Now that the installation is complete, however, I have a US keyboard with no obvious way to change it (and no obvious way to type the € symbol). I am, of course, interested in fixing this, but I’d also like to know why this happened in the first place.
Right click on the Keyboard Layout Handler icon in your LXPanel. Choose Keyboard Layout Handler settings. Untick Keep system layouts and then click add. Choose Irish which I believe will show up as ie. You can then move it to the top to have it be the default or keep it where it is and just toggle when you need it. Check Keep system layouts. I believe that it will not take effect until the next boot.