Missing dependencies on Ubuntu 18.04 LTS

[ajsb85]

Errors printed:

Package libgpod-nogtk-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  libgpod-dev:i386 libgpod-dev

E: Package 'libgpod-nogtk-dev' has no installation candidate

Gtk-Message: 02:18:01.381: Failed to load module "canberra-gtk-module"