Emulating AltGr with Ctrl+Alt doesn´t work for LibreOffice Writer.

I am Swedish, so I normally type with a Swedish keyboard layout. I have a US English keyboard, that doesn´t have an AltGr key, so I cannot use it to type some of the special characters. Now, I just learned that Ctrl+Alt can be used as well instead of AltGr and checked it out. It works fine for all LibreOffice programs, except Writer, the one I am using most. Nothing comes out in Writer. It also works with my other Windows applications.

Easy come - easy go, I am unhappy again about the missing AltGr.

Why is this, and what can be done about it?

The right ALT key is the AltGr-key. It might not be marked as AltGr as on my US-keyboard (HP).

EDIT: You can use the Compose Character Extension (3 keystrokes instead of one).

Install US-International Keyboard (Windows) and use it for Umlauts, accented character (Accent 1. than Character "+a → ä ) but you will not get your Swedish characters.

Try the onscreen keyboard, it displays the special characters when you click AltGr.