Couldn't install Discord (unmet dependencies)

Question

I was trying to install a .deb file(discord)

while doing so, i met with this error

 discord : Depends: libgconf-2-4 but it is not installed
           Depends: libc++1 but it is not installed
           Recommends: libappindicator1 but it is not installed or
                       libayatana-appindicator1 but it is not installed

so i decided to install libgconf-2-4 and met with another error :(

 discord : Depends: libc++1 but it is not going to be installed
           Recommends: libappindicator1 but it is not going to be installed or
                       libayatana-appindicator1 but it is not going to be installed
 libgconf-2-4 : Depends: gconf2-common (= 3.2.6-7ubuntu1) but it is not going to be installed
                Recommends: gconf-service

then tried installing libc++1 and met with the same error

discord : Depends: libgconf-2-4 but it is not going to be installed
           Recommends: libappindicator1 but it is not going to be installed or
                       libayatana-appindicator1 but it is not going to be installed
 libc++1 : Depends: libc++1-12 (>= 12~) but it is not going to be installed

need help