The command is :
$ sudo apt-get install ooniprobe
[sudo] password :
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
ooniprobe : Depends: python-txsocksx but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
The output of "/etc/apt/sources.list " is :
# deb cdrom:[Debian GNU/Linux 7.7.0 _Wheezy_ - Official Multi-architecture amd64/i386 NETINST #1 20141018-13:43]/ wheezy main
#deb cdrom:[Debian GNU/Linux 7.7.0 _Wheezy_ - Official Multi-architecture amd64/i386 NETINST #1 20141018-13:43]/ wheezy main
deb
http://ftp.us.debian.org/debian/ wheezy main
deb-src
http://ftp.us.debian.org/debian/ wheezy main
deb
http://security.debian.org/ wheezy/updates main
deb-src
http://ftp.us.debian.org/debian/ wheezy/updates main
# wheezy-updates, previously known as 'volatile'
deb
http://ftp.us.debian.org/debian/ wheezy-updates main
deb-src
http://ftp.us.debian.org/debian/ wheezy-updates main
# wheezy-backports
deb
http://http.debian.net/debian/ wheezy-backports main contrib non-free
#OpenVAS
deb
http://download.opensuse.org/reposit...v6/Debian_7.0/ ./
#Backports
deb
http://ftp.debian.org/debian/ wheezy-backports main
deb
http://http.debian.net/debian wheezy-backports main