Problems with OA2 installation on Ubuntu 12.04 LTS

Hi all,

The installation process skips 'Configure site' step and finish with a blank page
with the link:

http://localhost/oatrium/install.php?profile=openatrium&locale=en&id=1&o...

If I go over the link:

http://localhost/oatrium/install.php

to repeat the process, it ends at the 'Configure site' step, but showing the messages
showed on the attached images.

Apparently it works, but if goin the admin menu, it stops working showing messages like:

Notice: Undefined index: highlighted in include() (line 126 of /var/www/oatrium/modules/system/page.tpl.php).
Notice: Undefined index: sidebar_first in include() (line 138 of /var/www/oatrium/modules/system/page.tpl.php).
Notice: Undefined index: sidebar_second in include() (line 144 of /var/www/oatrium/modules/system/page.tpl.php).
Notice: Undefined index: oa_radix in drupal_theme_initialize() (line 100 of /var/www/oatrium/includes/theme.inc).
Notice: Trying to get property of non-object in _drupal_theme_initialize() (line 146 of /var/www/oatrium/includes/theme.inc).
Notice: Trying to get property of non-object in _theme_load_registry() (line 335 of /var/www/oatrium/includes/theme.inc).
Notice: Undefined index: oa_radix in theme_get_setting() (line 1419 of /var/www/oatrium/includes/theme.inc).
Notice: Trying to get property of non-object in theme_get_setting() (line 1456 of /var/www/oatrium/includes/theme.inc).
Notice: Trying to get property of non-object in theme_get_setting() (line 1466 of /var/www/oatrium/includes/theme.inc).