VBox installation enhancements fail to connect cn.archive.ubuntu.com issues

This problem is usually the data source (http://us.archive.ubuntu.com/or http://cn.archive.ubuntu.com/) is wrong , my approach is:

Modify the /etc/apt/sources.list(the file must be modified under root privileges)

Execute the following command:

vim /etc/apt/sources.list

After opening, enter the following command:  
:%s/us.archive/cn.archive/g (The command is a string substitution, us.archive replace Cn.archive "
then enter  
: Wq Save, exit

Then, mount the shared file

Files such as linux-headers may need to be installed first:

The command is as follows:

#安装linux-headers:

sudo apt-get install linux-headers-$ (uname-r)

Install build-essential (Build Environment Suite: g++,dpkg-dev,libc6-dev,make)

sudo apt-get install build-essential

Finally, mount the shared file:

sudo mount-t vboxsf share/mnt

OK, finished!

VBox Installation enhancements failed with cn.archive.ubuntu.com issues