Error while istalling Drupal 7

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This passage provides some solutions for errors while installing Drupal 7.

All the operations are based on Ubuntu.

PHP extensions disables error

Firstly, type

sudo apt-get install php5.6-xml php5.6-pdo php5.6-common php5.6-gd php5.6-dom

. (Attention: the command above depends on your version of PHP)

Then just type

sudo apt-get install libapache2-mod-auth-pgsql

(for PostgreSQL) or

sudo apt-get install libapache2-mod-auth-mysql

(for MySQL) to resolve this problem.

The command above will install some PHP extensions.

File system error

Just use

chmod 777 sites/default/files

(Attention for the path) to authorize public rights.

Settings file error

Just use

chmod 777 sites/default/settings.php

(Attention for the path) to authorize public rights.