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in reply to RRDs Installation problem

As Anonymous said, you may have deleted a system directory and your system may be broken and need reinstallation. First, use 'aptitude' instead of 'apt-get', it's more advanced; aptitude and apt-get share most options. You should first try to repair the installation:

aptitude update aptitude install -f

This should update/remove/install needed packages.

If these commands fail to set back the system to a working state, as apparently you're not a skilled Debian administrator, you must consider your system broken. You'll have to reinstall it from scratch. else you can retry to install :

aptitude install librrds-perl