fixes duplicate dict keys. Fixes #7964

src/common/helpers.py

@@ -919,13 +919,11 @@ distro_info = {
         'Aurox Linux': '/etc/aurox-release',
         'Conectiva Linux': '/etc/conectiva-release',
         'CRUX': '/usr/bin/crux',
-        'Debian GNU/Linux': '/etc/debian_release',
         'Debian GNU/Linux': '/etc/debian_version',
         'Fedora Linux': '/etc/fedora-release',
         'Gentoo Linux': '/etc/gentoo-release',
         'Linux from Scratch': '/etc/lfs-release',
         'Mandrake Linux': '/etc/mandrake-release',
-        'Slackware Linux': '/etc/slackware-release',
         'Slackware Linux': '/etc/slackware-version',
         'Solaris/Sparc': '/etc/release',
         'Source Mage': '/etc/sourcemage_version',