Package: keepassx
KeePassX 2.0, the new upstream version, stores password databases in a format
incompatible with KeePassX 0.4. As a result, some users may prefer to keep the
old version for interoperability.
However, because Debian package for KeePassX 2.0 uses the same name as KeePassX
0.4, it is not possible to install both version simultaneously. I think the
right choice would have been to package KeePassX 2.0 under a different name
(e.g. keepassx2) because it is so much different from KeePassX 0.4.