LifeCycle Manager is missing on vSphere UI , Unable to perform the ESXI upgrade

Products

• VMware vSphere ESXi
• VMware vCenter Server 7.0

Issue/Introduction

• LifeCycle Manager tab is missing for vCenter Inventory objects in vSphere-Client
• Updates tab on all the ESXI hosts on Vcenter is blank and has no view
• Administration -> Solutions -> Client Plug-Ins ->VMware vSphere LifeCycle Manager plugin -> Status is "incompatible"
• Cannot ENABLE the plugin as it is greyed out 

Environment

• VMware vCenter Server Appliance 7.x

Cause

• vSphere LifeCycle Manager (vLCM) plugin is marked as incompatible in /etc/vmware/vsphere-ui/compatibility-matrix.xml, it means that the vSphere UI will not display the vLCM 
  cat /etc/vmware/vsphere-ui/compatibility-matrix.xml | grep -i com.vmware.vum.client

Resolution

1. Take a snapshot of the vCenter (if vCenter is in ELM mode take offline / powered off snapshots )
2. Fix the compatibility matrix.xml
3. SSH into the vCenter Server.
4. Navigate to the compatibility matrix location:
   cd /etc/vmware/vsphere-ui/
5. Back up the original file:
   cp compatibility-matrix.xml compatibility-matrix.xml.bak
6. Manually edit the file using vi editor and change the parameter  <PluginPackage id="com.vmware.vum.client" status="incompatible"/> to  <PluginPackage id="com.vmware.vum.client" status="compatible"/>
7. Look for the entry related to LifeCycle Manager or vum,If marked as "incompatible", change it to "compatible"
   vi /etc/vmware/vsphere-ui/compatibility-matrix.xml
8. Confirm the changes to the file
9. To save the changes, press esc:wq!
10. Restart the vsphere-ui and vmware-updatemgr services
    service-control --restart vmware-updatemgr
service-control --restart vsphere-ui
11. LifeCycle Manager should be visible now
    
    

Additional Information

Plug-in Marked As Incompatible