- - -

sudo vim /etc/default/locale

LANG="en_US.UTF-8"
LANGUAGE="en_US:en"
LC_NUMERIC="pt_BR.UTF-8"
LC_TIME="pt_BR.UTF-8"
LC_MONETARY="pt_BR.UTF-8"
LC_PAPER="pt_BR.UTF-8"
LC_NAME="pt_BR.UTF-8"
LC_ADDRESS="pt_BR.UTF-8"
LC_TELEPHONE="pt_BR.UTF-8"
LC_MEASUREMENT="pt_BR.UTF-8"
LC_IDENTIFICATION="pt_BR.UTF-8"

- - -

KEYBOARD LAYOUT:

    Portuguese (Brazil)
    English (US, int., with dead keys)

How to Fix Cedilla (C->Ç/c->ç):
    sudo vim /usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/immodules.cache
        "cedilla" "Cedilla" "gtk30" "/usr/share/locale" "az:ca:co:fr:gv:oc:pt:sq:tr:wa" -> "az:ca:co:fr:gv:oc:pt:sq:tr:wa:en"

    sudo vim /usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/immodules.cache
        "cedilla" "Cedilla" "gtk30" "/usr/share/locale" "az:ca:co:fr:gv:oc:pt:sq:tr:wa" -> "az:ca:co:fr:gv:oc:pt:sq:tr:wa:en"

    sudo sed -i /usr/share/X11/locale/en_US.UTF-8/Compose -e 's/ć/ç/g' -e 's/Ć/Ç/g'

    sudo vim /etc/environment
        GTK_IM_MODULE=cedilla
        QT_IM_MODULE=cedilla

- - -