i cant install subversion

[waihung]

i cant install subversion.
i get a message as follow (when i enter sudo apt-get install subversion), which i do not know what it means,

Some packages could not be installed. This may mean you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming.
The following information may help to resolve the situation :

The following packages has unmet dependencies:
subversion: Depends: libsvn (= 1.5.ldfsg1-4) but it is not going to be installed
E : Broken packages

pls help. thanks.

[reer]

"subversion: Depends: libsvn ..." means you should install libsvn frist.