change apt sources to apt-get

src/core.py

@@ -257,7 +257,7 @@ def exit_ptf():
 # if it can't find it, will default to manual install base
 def profile_os():
     # if we are running a debian variant
-    if os.path.isfile("/etc/apt/sources.list"):
+    if os.path.isfile("/usr/bin/apt-get"):
         return "DEBIAN"
     if os.path.isfile("/etc/arch-release"):
         return "ARCHLINUX"