我已经下载了 tar.gz 文件。但我不知道如何安装它。我如何安装这种文件？
我正在使用几天前安装的 Ubuntu 13.04。我正在尝试安装nodejs和npm. 我尝试先从命令行安装，然后卸载它。然后东西坏了。
sudo apt-get install -f nodejs npm
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:
nodejs …我已经安装了 Ubuntu 14.04，它已经有 Firefox v31。我想安装旧版本的 Firefox。我该怎么做？