To detect bad packages, it must be existing a matching pattern list file.
Path is defined in OPKG_BAD_PATTERN_LIST_FILE.
This gives the option to filter some bad entries in the package listing menue.
NOTE: a sample file you should find here as : "/var/tuxbox/config/bad_package_pattern.list.sample".
If required, remove the ".sample" extension and change the entries for your requirements
