Ubuntu 20.x Japanese support

Keyboard layout First, set the keyboard layout

$ sudo dpkg-reconfigure keyboard-configuration

When the screen changes, set the keyboard according to the following procedure

Generic 105-key PC (intl.) → Japanese → Japanese → The default for the keyboard layout → No compose key → Yes

Japanese language Install a language set that supports Japanese input

$ sudo apt install ibus-mozc

Then do the following to add the input source (Settnigs can be opened from Ubuntu search)

Settings → Region & Language → Input sources + → Japanese → Japanese (Mozc)

MOZC Specify the layout used in MOZC

$ sudo vi /usr/share/ibus/component/mozc.xml

Change as follows

<layout>default</layout> → <layout>jp</layout>

X Desktop

$ gnome-session-properties

Add → setxkbmap jp → Save

For Name, put set xkbmap jp in Command and save it.

If you reboot at the end, you should be able to switch the input source with the Windows key and the space key, and switch between romaji and hiragana with half-width/full-width.