1.dpkg status database is locked by another process
https://my.oschina.net/congqian/blog/126821
2.rpm: RPM should not be used directly install RPM packages, use Alien instead
https://blog.csdn.net/suleil1/article/details/49471723
3.bash：yum:command not found 解决办法【转】（不同系统结合不同命令处理，此处主要是安装yum）
https://blog.csdn.net/tianxiaoyu1987/article/details/87373139