Как установить lsof на Debian / kFreeBSD?

Как установить lsof на Debian / kFreeBSD Testing (Wheezy/Sid)?

$ apt-get install lsof
Package lsof 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 'lsof' has no installation candidate

изменить:
/и т. д./кв/источников.список:

deb http://http.debian.net/debian/ testing main contrib non-free
deb-src http://http.debian.net/debian/ testing main contrib non-free

deb http://security.debian.org testing/updates main contrib non-free
deb-src http://security.debian.org testing/updates main contrib non-free