Version 12-4 of syslinux-themes-debian is marked for autoremoval from testing on Fri 13 Jul 2018. It depends (transitively) on memtest86+, affected by #900399. You should try to prevent the removal by fixing these RC bugs.
Last update: 2018-06-19
Standards version of the package is outdated.
The package is severely out of date with respect to the Debian Policy.The package should be updated to follow the last version of Debian Policy
(Standards-Version 4.1.4 instead of
This package has been
orphaned. This means that it does not have a real
maintainer at the moment. Please consider adopting this package
if you are interested in it. Please see bug number #719550 for more information.