Specify both packages at the command line at the same time, e.g. with apt: apt-get install libstdc++6-4.2-dev g++-4.2.deb <div class="gmail_quote">2008/6/21 Nguyễn Hồng Quân <<a href="mailto:ng.hong.quan@gmail.com">ng.hong.quan@gmail.com</a>>: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">In order to install g++-4.2.deb, I have to have already had libstdc++6-4.2-dev. But to install libstdc++6-4.2-dev.deb, the g++-4.2 must exist. So how can I install them? -- Ubuntu-devel-discuss mailing list <a href="mailto:Ubuntu-devel-discuss@lists.ubuntu.com">Ubuntu-devel-discuss@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss</a> </blockquote></div>