Entered Post Install...Relaxing execute permission for other users on /u01/oem/agent/agent_13.3.0.0.0/install for bug#20005612agenthome is /u01/oem/agent/agent_13.3.0.0.0 /u01/oem/agent/ADATMP_2019-10-16_14-39-16-PM/plugins.txt not found. The Management Agent installation failed. The plug-in oracle.sysman.oh may not be present in the Management Agent software. Ensure that the Management Agent software has the oracle.sysman.oh monitoring and discovery plug-in.
查找MOS文章EM13c: Agent Push Failed During the Plug-in Deployment With Error "plugins.txt not found" (Doc ID 2563545.1)给出相应解决方法为，调整版本号13.2.0.0.0>>13.3.0.0.0，并把指定文件复制到目标端相应目录重新部署。
Create a directory on the OMS host with name "plugins"Copy these files in the plugins directory.
MW_HOME/sysman/install/plugins/oracle.sysman.oh/13.2.0.0.0/oracle.sysman.oh.agent.plugin-13.2.0.0.0.farb
MW_HOME/sysman/install/plugins/oracle.sysman.oh/13.2.0.0.0/oracle.sysman.oh.discovery.plugin-13.2.0.0.0.farb
Create a file "plugins.txt" with following conent
.oracle.sysman.oh|13.2.0.0.0| |discoveryPlugin
oracle.sysman.oh|13.2.0.0.0| |agentPlugin
Copy plugins.txt and plugins directory to destination host and place at <AGENT_BASE_DIR>/ADATMP_<TIMESTAMP>/Clicked on Retry Using Same Inputs on UI.
Agent installation should complete.Execute <AGENT_BASE_DIR>/agent_13.2.0.0.0/root.sh as a root user.