回答一：通过更新后安装（安装成功）
首先是
#sudo apt-get update
更新到后面会遇到这个问题
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://security.ubuntu.com lucid-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
……
这时进行安装git
#sudo apt-get install git
会出问题:git:depends:liberror-perl but it is not installable
发现还是缺少包，就是更新不完全
解决方案
#sudo apt-get clean
#cd /var/lib/apt
#sudo mv lists lists.old
#sudo mkdir -p lists/partial
#sudo apt-get clean
#sudo apt-get update
这时再安装就可以成功了
#sudo apt-get install git
另一个回答：
试一下如下命令：
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install -f 