Handle line breaks properly

src/modules/unpackfs/main.py

@@ -124,8 +124,8 @@ class UnpackOperation:
 
                 if entry.sourcefs == "squashfs":
                     if shutil.which("unsquashfs") == None:
-                        return ("Failed to unpack image", "Failed to find unsquashfs, make sure you have
-                        the squashfs-tools package installed")
+                        return ("Failed to unpack image", "Failed to find unsquashfs, make sure you have "
+                        "the squashfs-tools package installed")
 
                     fslist = subprocess.check_output(["unsquashfs",
                                                         "-l",