Unable to install NetVault Server 10x or 11x on a Linux system - Error: Problem running post-install step. Installation did not complete correctly. (4041799)

Unable to install NetVault Server 10x or 11x on a Linux system - Error: Problem running post-install step. Installation did not complete correctly.

When installing NetVault Server 10x or newer the process ends with:

Error: Problem running post-install step. Installation did not complete correctly.

Error running /etc/init.d/netvault-pqsql start: pg_ctl: could not start server

Examining the install.log (located in /tmp) you may also see:

Executing su -s /bin/sh netvault-pgsql -c 'LD_LIBRARY_PATH="/usr/netvault/pgsql/lib":$LD_LIBRARY_PATH "/usr/netvault/pgsql/bin/pg_ctl" status -D "/usr/netvault/db/pgsql"'
Script exit code: 3

Script output:
 pg_ctl: no server running

Script stderr:
 child process exited abnormally

Error running su -s /bin/sh netvault-pgsql -c 'LD_LIBRARY_PATH="/usr/netvault/pgsql/lib":$LD_LIBRARY_PATH "/usr/netvault/pgsql/bin/pg_ctl" status -D "/usr/netvault/db/pgsql"': child process exited abnormally
[12:50:20] Starting PostgreSQL database server...
Installing PostgreSQL: Starting service
Executing /etc/init.d/netvault-pgsql start
Script exit code: 1

The postgresql server could not resolve localhost from the /etc/hosts file due to the file permissions. The permissions were rw_r_____ (640) which denied the netvault-pgsql user the read permission.

Change the permission on the hosts file to rw_r__r__ (644).

chmod 622 hosts

or

chmod +r hosts