Bug#907561: gnome-software: software fails to start: Failed to map ISO639 to language names

[Maarten de Jong]

Package: gnome-software
Version: 3.28.2-1
Severity: important

Dear Maintainer,

After moving from testing to unstable, I've been unable to start gnome-software. 
I have purged the package and reinstalled it but this doesn't fix it.
When running gnome-software from the terminal, i get the following error:

12:18:38:0278 Gs  Failed to map ISO639 to language names: cannot find source file : '/usr/pkg/share/xml/iso-codes/iso_639.xml'
Trace/breakpoint trap

At the beginning it also says in red: plugin appstream took 2.2 seconds to do setup
But i don't think that's relevant.

Since it's got to do with iso-codes i tried reinstalling iso-codes, which did not work. 
I downloaded the source code of iso-codes(sudo apt source iso-codes), but i still got the error.

so:
expected outcome: gnome-software runs when clicking on software.
real outcome: gnome-software fails to run, gives an error instead. 

This is on a debian minimal install (netinst, didn't select anything when installing), with gnome-core installed.

My sources:
deb http://ftp.nl.debian.org/debian/ unstable main contrib non-free
deb-src http://ftp.nl.debian.org/debian/ unstable main contrib non-free

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.17.0-3-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gnome-software depends on:
ii  appstream                                    0.12.2-2
ii  apt-config-icons                             0.12.2-2
ii  dconf-gsettings-backend [gsettings-backend]  0.28.0-2
ii  gnome-software-common                        3.28.2-1
ii  gsettings-desktop-schemas                    3.28.0-1
ii  libappstream-glib8                           0.7.12-1
ii  libatk1.0-0                                  2.28.1-1
ii  libc6                                        2.27-5
ii  libcairo2                                    1.15.12-1
ii  libfwupd2                                    1.1.1-1
ii  libgdk-pixbuf2.0-0                           2.36.12-2
ii  libglib2.0-0                                 2.56.1-2
ii  libgnome-desktop-3-17                        3.28.2-2
ii  libgspell-1-1                                1.6.1-1
ii  libgtk-3-0                                   3.22.30-2
ii  libgtk3-perl                                 0.034-1
ii  libgudev-1.0-0                               232-2
ii  libjson-glib-1.0-0                           1.4.2-4
ii  libpackagekit-glib2-18                       1.1.10-1
ii  libpolkit-gobject-1-0                        0.105-21
ii  libsecret-1-0                                0.18.6-2
ii  libsoup2.4-1                                 2.62.2-2
ii  packagekit                                   1.1.10-1
ii  software-properties-gtk                      0.96.20.2-1

gnome-software recommends no packages.

Versions of packages gnome-software suggests:
pn  apt-config-icons-hidpi         <none>
pn  fwupd                          <none>
pn  gnome-software-plugin-flatpak  <none>
pn  gnome-software-plugin-limba    <none>
pn  gnome-software-plugin-snap     <none>

-- no debconf information