I setup Ubuntu 19.04, however I did not do the keyboard detection option. Now I get a “ charter each time I enter the @.
You can open a shell terminal and use the command
sudo dpkg-reconfigure keyboard-configuration
From the man pages:
dpkg-reconfigure reconfigures packages after they have already been installed. Pass it the names of a package or packages to reconfigure. It will ask configuration questions, much like when the package was first installed.