Did you install all the PHP5 packages that you need, or did you just install the bare minimum?
To install all the popular packages in one go:
Code:
apt-get install php5-common php5-cgi php5-curl php5-dev php5-gd php5-idn php-pear php5-imap php5-mcrypt php5-memcache php5-mhash php5-ming php5-mysql php5-pgsql php5-pspell php5-recode php5-snmp php5-sqlite php5-tidy php5-xmlrpc php5-xsl
And restart apache2 to see if things look better.
If it still doesn't work, check your php.ini (probably located in /etc/php5/apache2)
If you see the line that says:
Code:
allow_url_fopen = 'off'
Change it to:
Code:
allow_url_fopen = 'on'
And restart apache2 to see if things look better.
But DON'T enable allow_url_fopen unless you know what you're doing. Depending on the scripts you use, enabling it could make your site vulnerable to really easy attacks.