"vPostgres firstboot (action=firstboot) failed" error while upgrading vCenter Server from 5.x to 6.x

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VMware vCenter Server

Symptoms:

Upgrading from vCenter Server 5.x to vCenter Server 6.0 fails with the error:

Encountered an internal error. see C:\ProgramData\vCenterServer\logs\firstboot\vpostgres-firstboot.py_344_stderr.log
In the C:\ProgramData\vCenterServer\logs\firstboot\vpostgres-firstboot.py_344_stderr.log file, you see entries similar to:

vPostgres firstboot(action=firstboot) failed
In the C:\ProgramData\Vmware\CIS\logs\vmware\vpx\vcdb_import.err file, you see entries similar to:

Traceback (most recent call last):
File "C:\Program Files\VMware\vCenter Server\cis_upgrade_runner\payload\component-scripts\vcdb\windows\import\convert.py", line 4, in <module>s_u16 = f1.read()
File "C:\Program Files\VMware\vCenter Server\python\lib\codecs.py", line 668, in read return self.reader.read(size)
File "C:\Program Files\VMware\vCenter Server\python\lib\codecs.py", line 474, in read newchars, decodedbytes = self.decode(data, self.errors)
File "C:\Program Files\VMware\vCenter Server\python\lib\encodings\utf_16.py", line 106, in decode codecs.utf_16_ex_decode(input, errors, 0, False)
MemoryError

VMware vCenter Server Appliance 6.0.x
VMware vCenter Server 6.0.x

This issue occurs when vCenter Server does not have enough memory to complete the installation.

To resolve this issue, increase the vCenter Servers memory to at least 16GB.

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