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[root@nagios3 nagiosxi]# ./B-installxi
Installing Nagios XI base files...
Creating product directory...
Adding password for user nagiosadmin
Building latest perms binary...
~/Desktop/nagiosxi/nagiosxi/basedir/scripts ~/Desktop/nagiosxi
~/Desktop/nagiosxi
Checking PostgresQL status...
PostgresQL running - continuing...
Creating role and database...
-bash: /root/Desktop/nagiosxi/nagiosxi/create_postgres_db.sh: Permission denied
ERROR: PostgresQL user 'nagiosxi' was not created - exiting.
ERROR: Nagios XI database was not setup properly - exiting.
[root@nagios3 nagiosxi]#


can we help me pls.

As noted in the documentation, you should start the install process from the /tmp directory, not /root.