Ubuntu – Enabling/installing Japanese input

Did you mean Kana input?

ibus-anthy has multiple ways of entering the kana. Default mode is via phonetic romaji (roman alphabets). You can change the input mode to Kana input, which uses the hiragana on the keyboard as you asked.

Since you got ibus-anthy set up, I assume have a toolbar like this floating on your desktop or glued to your panel (source: Ubuntulinux.jp Wiki article on IbusAnthy):

See the third button from the left, with the symbol R. That is the button for selecting input type. R denotes romaji input type. Kana input should be selectable by clicking on that button.

1. You said you chose OADG 109A but the Japanese switch key didn't respond. Does other buttons, say, like the @ key map correctly?
2. I assume by Japanese switch key you mean the one to the left of 1 key, i.e. the Zenkaku_Hankaku key. Di you mean that pressing that key didn't enable Japanese (romaji) input mode? It's possible that your ibus-anthy didn't have Zenkaku_Hankaku as the shortcut to toggle Japanese input. It's configurable via Anthy preferences.

I prefer fcitx-mozc than iBus-Anthy.
Because it's efficient when I type Japanese, it suggests with its prediction.
E.g. When I type 'きょ' and it shows a panel with the word list
such as 今日　教科　教室　強化 and I select one of them by
Tab and PgDn/Up or a mouse click.