I have checked all the locale related settings from 14.04 ~ 15.10
/etc/locale.alias
/etc/default/locale
/etc/timezone
/etc/localtime
all of those were good,
the second assumptioin is the package 'language-selector-gnome'
it seems to be changed somehow due to add fcitx packages.
it may goes wrong in the middle of the adding fcitx packages.
I have checked all the locale related settings from 14.04 ~ 15.10
/etc/locale.alias
/etc/default/locale
/etc/timezone
/etc/localtime
all of those were good,
the second assumptioin is the package 'language- selector- gnome'
it seems to be changed somehow due to add fcitx packages.
it may goes wrong in the middle of the adding fcitx packages.