Thanks markus, it didnt work or I enterd it wrong
Take a look

root@Linuxbox:/home/knoppix# dpkg -i --force-overwrite
dpkg: --install needs at least one package archive file argument

Type dpkg --help for help about installing and deinstalling packages[*];
Use dselect for user-friendly package management;
Type dpkg -Dhelp for a list of dpkg debug flag values;
Type dpkg --force-help for a list of forcing options;
Type dpkg-deb --help for help about manipulating *.deb files;
Type dpkg --licence for copyright licence and lack of warranty (GNU GPL)[*].

Options marked[*] produce a lot of output - pipe it through `less' or `more' !
root@Linuxbox:/home/knoppix# /var/cache/apt/archives/libxcursor-dev_1.0.2-4_i386.deb
bash: /var/cache/apt/archives/libxcursor-dev_1.0.2-4_i386.deb: Permission denied
root@Linuxbox:/home/knoppix#