相关疑难解决方法(0)

我检查了系统上的 gcc 版本。

目前是 4.6.3。我读到 gcc-4.8 已经出来了。

我尝试了以下命令但没有成功：

sudo apt-get install gcc (gcc is already the newest version)
sudo apt-get install gcc-4.8 (unable to locate package)

有谁知道如何在 12.04 上安装这个包？

我尝试了以下方法：

sudo apt-get install build-essential 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
build-essential is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

但是当我编译终端显示以下内容时：

g++ hello.cpp -o hello
The program 'g++' can be found in the following packages:
 * g++
 * pentium-builder
Try: sudo apt-get install <selected package>

我该怎么办？