完美解决Unable to locate package、 files failed to download、fail to fatch;not get lock

（1）安装软件sudo apt-get install **，显示“E: Unable to locate package **”：

>>>解决方法：sudo apt-get update ;sudo apt-get upgrade

如果更新出现错误：E: Some index files failed to download, they have been ignored, or old ones used instead.

>>>解决方法：sudo rm -r /var/lib/apt/lists/*；sudo apt-get update

如果再次更新仍出现错误：err: fail to fatch.............

>>>解决方法：换源 sudo gedit /etc/apt/sources.list(更换为阿里云，或者网易云的源文件)

             换源成功后再次运行更新。

如果此时出现E: Could not get lock /var/cache/apt/archives/lock–open (11: Resource temporarily unavailable)；E: Unable to lock directory /var/cache/apt/archives/

>>>解决方法：杀死相关进程 sudo rm/var/cache/apt/archives/lock

                          Sudo rm/var/lib/dpkg/lock

             再次运行更新命令即可。

（2）安装软件时：E: Unmet dependencies. Try using -f.

>>>解决方法： sudo apt install -f并输入Y恢复依赖关系，然后再次执行安装命令。