在源码目录下输入：ddms
    出错如下：
    no command 'ddms' found, did you mean:
    command 'dkms' from package 'dkms' (main)
    command 'xdms' from package 'xdms' (universe)
    command 'dds' from package 'dds' (universe)
    ddms:command not found