I can't install python-openssl, code:

/home/user # apt-get install python-openssl
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package python-openssl is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package python-openssl has no installation candidate

The python-setuptools installation went OK (I guess). Any ideas?