debian:~# touch /etc/default/ssh
debian:~# apt-get -o DPkg::Options::="--force-confmiss" --reinstall  install ssh openssh-server
Reading package lists... Done
Building dependency tree... Done
0 upgraded, 0 newly installed, 2 reinstalled, 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.
Do you want to continue [Y/n]? y
Setting up openssh-server (4.3p2-7) ...

Setting up ssh (4.3p2-7) ...

debian:~#