apt-listbugs is a tool which retrieves bug reports from the Debian Bug Tracking System and lists them. Especially, it is intended to be invoked before each upgrade/installation by apt in order to check whether the upgrade/installation is safe.

Most of Debian developers use the unstable version of Debian and some users also use it because the version is the latest snapshot which includes many new features and packages.

apt is a great convenient tool to follow your system to the latest version easily. On the other hand, the feature also makes your system break easily. If a package is broken and uploaded to the Debian unstable, the package will be installed on many Debian system soon.

This tool aims to make the broken upgrade as save as possible. You can check whether the upgrade is safe or not just before the upgrade.

More information on this package can be found on the Debian web site