Alfresco linux installer not working on ubuntu

drwxr-xr-x 15 root root      4096 Dec  6 16:03 .
drwxr-xr-x 23 root root      4096 Jun  8  2015 ..
-rwxrwxrwx  1 root root       294 Oct 13 15:31 alfinstall.sh
drwxr-xr-x 15 root root      4096 Nov 10 07:44 alfresco-5.2
drwxr-xr-x  8 root root      4096 Dec  6 11:03 alfresco_ear
drwxr-xr-x  3 root root      4096 Dec  6 11:03 alfresco_ear_5.2
-rwxrwxrwx  1 root root 634144266 Dec  6 16:06 alfresco-enterprise-4.2.7-installer-linux-x64.bin
drwxr-xr-x  4 root root      4096 Nov 10 12:40 alfresco-one-tas
drwxr-xr-x  4 root root      4096 Nov 10 12:54 alfresco-tas
drwxr-xr-x  9 root root      4096 Sep 22 15:52 apache-tomcat-7.0.72
-rw-r--r--  1 root root   8931288 Sep 22 15:53 apache-tomcat-7.0.72.tar.gz
drwxr-xr-x  3 root root      4096 Sep  5 11:13 CenteraSDK3.3
drwxr-xr-x  3 root root      4096 Jul 26 08:18 docker_forgerock
-rw-r--r--  1 root root     19535 Jun 13 12:44 fmw_12211_readme.htm
-r-xr-xr-x  1 root root 829753003 Oct  9 21:49 fmw_12.2.1.2.0_wls.jar
-rw-r--r--  1 root root      8986 Oct 11 14:55 fmw_12212_readme.htm
-rw-r--r--  1 root root       158 Oct 27 13:41 install_opts
-rw-r--r--  1 root root 258544966 Sep 22 14:32 OpenAM-13.0.0.zip
drwxr-xr-x  3 root root      4096 Sep 22 14:48 openam_unzipped
drwxr-xr-x 14 root root      4096 Sep 28 13:24 solr4
drwxr-xr-x  4 root root      4096 Oct  3 12:23 wlc_alf_data
drwxr-xr-x  4 root root      4096 Oct  3 08:55 wlc_alf_data5.2
drwxr-x---  4 root root      4096 Oct  6 21:20 wlc_alf_data_servlet
root@AFUbuntu:/opt#
root@AFUbuntu:/opt# ./ alfresco-enterprise-4.2.7-installer-linux-x64.bin
-bash: ./: Is a directory
root@AFUbuntu:/opt# ./alfresco-enterprise-4.2.7-installer-linux-x64.bin
Language Selection

Please select the installation language
[1] English - English
[2] French - Français
[3] Spanish - Español
[4] Italian - Italiano
[5] German - Deutsch
[6] Japanese - 日本語
[7] Dutch - Nederlands
[8] Russian - Русский
[9] Simplified Chinese - 简体中文
[10] Norwegian - Norsk bokmål
[11] Brazilian Portuguese - Português Brasileiro
Please choose an option [1] :
----------------------------------------------------------------------------
Welcome to the Alfresco Enterprise Setup Wizard.

----------------------------------------------------------------------------
Installation Type

[1] Easy - Installs servers with the default configuration
[2] Advanced - Configures server ports and service properties.: Also choose optional components to install.
Please choose an option [1] :

----------------------------------------------------------------------------
Installation folder

Please choose a folder to install Alfresco Enterprise

Select a folder [/opt/alfresco-4.2.7]:

----------------------------------------------------------------------------
Admin Password

Please give a password to use for the Alfresco administrator account.

Admin Password: :
Repeat Password: :
Warning: Passwords Do Not Match!
Press [Enter] to continue :
----------------------------------------------------------------------------
Admin Password

Please give a password to use for the Alfresco administrator account.

Admin Password: :
Repeat Password: :
----------------------------------------------------------------------------
Install as a service

You can optionally register Alfresco Enterprise as a service. This way it will
automatically be started every time the machine is started.

Install Alfresco Enterprise as a service? [Y/n]: n


----------------------------------------------------------------------------
Setup is now ready to begin installing Alfresco Enterprise on your computer.

Do you want to continue? [Y/n]: Y

----------------------------------------------------------------------------
Please wait while Setup installs Alfresco Enterprise on your computer.

 Installing
 0% ______________ 50% ______________ 100%
 ############
Error: There has been an error.
Error running su postgres -c '"/opt/alfresco-4.2.7/postgresql/bin/psql"  -c
"ALTER USER postgres PASSWORD '\''****'\''" ' : psql.bin: could not connect to
server: Connection refused
        Is the server running on host "localhost" (127.0.0.1) and accepting
        TCP/IP connections on port 5432?
Press [Enter] to continue :
root@AFUbuntu:/opt#

Error: There has been an error.
Error running su postgres -c '"/opt/alfresco-4.2.7/postgresql/bin/psql"  -c
"ALTER USER postgres PASSWORD '\''****'\''" ' : psql.bin: could not connect to
server: Connection refused
        Is the server running on host "localhost" (127.0.0.1) and accepting
        TCP/IP connections on port 5432?
Press [Enter] to continue :