murat ~ # apt-cache showpkg firefox | more
Package: firefox
Versions:
42.0+linuxmint1+rosa (/var/lib/apt/lists/packages.linuxmint.com_dists_rafaela_upstream_binary-amd64_Packages) (/var/lib/dpkg/status)
Description Language:
File: /var/lib/apt/lists/packages.linuxmint.com_dists_rafaela_upstream_binary-amd64_Packages

apt-get install firefox=42.0+linuxmint1+rosa

kullanimi : paket_adi=versiyon