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# apt-get install -s htop
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
strace ltrace
The following NEW packages will be installed:
htop
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Inst htop (1.0.1-1 Debian:7.11/oldoldstable [amd64])
Conf htop (1.0.1-1 Debian:7.11/oldoldstable [amd64])
Have you run apt-get update? Maybe you need to look at your /etc/apt/sources.list