我正在尝试使用最新版本的ubuntu在我的eee pc中安装rails并且我有一些被告知installable的包。我可以吗？我甚至可以安装gem
fenec@fenec-laptop:~$ gem
The program 'gem' can be found in the following packages:
* rubygems1.8
* rubygems1.9.1
Try: sudo apt-get install <selected package>
gem: command not found
root@fenec-laptop:/home/fenec# apt-get install rubygems1.8
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package rubygems1.8 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package rubygems1.8 has no installation candidate
由于我的硬件，是否有可能无法安装某些软件包？我有这个问题只有这个版本的ubuntu我以前有ubuntu 8.10和rails就像魅力一样。