Please tell me how to set-up my system so that I could use a standard US English keyboard to type in Japanese with hiragana / katakana when using Office Libre.  I installed Japanese language pack and set-up my input method to accept Japanese, but nothing happened.  Later, I uninstalled the Japanese language pack, and then I tried to reinstall it, but my computer won't let me.  Instead, it shows an error message saying that the Japanese language pack is untrusted.

Here is the error message that appears:







p { margin-bottom: 0.1in; line-height: 120%; }

Requires
installation of untrusted packages

The action would
require the installation of packages from not authenticated sources.

firefox-locale-ja
gimp-help-ja language-pack-gnome-ja language-pack-gnome-ja-base
language-pack-ja language-pack-ja-base libreoffice-help-ja
libreoffice-l10n-ja