debian:~# apt-get -o DPkg::Options::="--force-overwrite --force-confmiss" install ssh openssh-server
Reading package lists... Done
Building dependency tree... Done
ssh is already the newest version.
openssh-server is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
Need to get 0B of archives.
After unpacking 0B of additional disk space will be used.
dpkg: unknown force/refuse option `overwrite --force-confmiss'
Type dpkg --help for help about installing and deinstalling packages [*];
Use `dselect' or `aptitude' 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 --license for copyright license and lack of warranty (GNU GPL) [*].
Options marked [*] produce a lot of output - pipe it through `less' or `more' !
E: Sub-process /usr/bin/dpkg returned an error code (2)