No PostgreSQL clusters exist; see "man pg_createcluster"

Solution :

Run commands :
dpkg-reconfigure locales

pg_createcluster 9.3 main --start
or
pg_createcluster 9.4 main --start
or
pg_createcluster 9.5 main --start
(depends on your postgresql version.)

Ubuntu Apache php error : Class 'NumberFormatter' not found

Solution :

Install Package :
apt-get install php5-intl
or
apt-get install php-intl


Make sure intl.so file is generated and it is defined as an extension in .ini file.
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