vCenter Server Appliance 6.7 Upgrade Fails During Firstboot - VMware Update Manager Firstboot Failed - "Failed to create VUM database"

Products

• VMware vCenter Server

Issue/Introduction

Symptoms:
To learn more about firstboot issues see: Understanding and Troubleshooting vCenter Server and vCenter Server Appliance 6.7 Firstboot Install/Deployment, Upgrade, or Migration Failures​.
To collect a log bundle or review log files for a vCenter Server Appliance install, upgrade, or migration issues reference Triaging a vCenter Server Appliance 6.0 installation, upgrade, or migration (6.0 U2m) failure.  The relevant logs will be on the newly deployed appliance.  

firstbootStatus.json contains the following:
 

"failedSteps": "updatemgr-firstboot"

updatemgr-firstboot.py_####_stderr.log contains the following: 

FATAL:  password authentication failed for user "vumuser"
 

Failed to create VUM database

Note: 

• vCenter Server Appliance - Firstboot logs are located in the /var/log/firstboot directory.

Environment

VMware vCenter Server Appliance 6.7.x

Cause

This issue occurs when the randomly generated password for vmuser contains "$_".  The prior substring in the password field is replaced during the import scripts for Update Manager which causes password inconsistencies.

Resolution

This issue was resolved vCenter Server Appliance 6.7.0b, build 8832884.  For more information see: Full Patch for VMware vCenter Server Appliance 6.7.0b.

Workaround:
To work around the issue, change the Update Manager database password and perform the vCenter Server 6.7 upgrade again. For further information on resetting the Update Manager password see: How to change vSphere update manager database password.