I examined the problem with plural Japanese users.
The suggestion that is most suitable as Japanese users is "add fonts-takao-pgothic to the Lubuntu ISO".
(The package size is 3.3MB)
"fonts-droid" was included in the Lubuntu ISO to 14.10. It can display Chinese and Japanese.
(The package size is 4MB)
I examined the problem with plural Japanese users.
The suggestion that is most suitable as Japanese users is "add fonts-takao-pgothic to the Lubuntu ISO".
(The package size is 3.3MB)
"fonts-droid" was included in the Lubuntu ISO to 14.10. It can display Chinese and Japanese.
(The package size is 4MB)
It can be settled in these fonts about Japanese.