I get this error on installing this product as root on CentOS. I just accepted all of the default install options. It seems to copy all of the files across and then run a series of checks. As you can see this test fails and so do all of the subsequent ones.
Error: Unknown error while running /opt/lampstack-5.4.15-0/php/bin/php -q
/opt/lampstack-5.4.15-0/php/bin/fixreg.php
/opt/lampstack-5.4.15-0/php/lib/php/.registry @@BITROCK_PHP_ROOT@@
/opt/lampstack-5.4.15-0/php
Press [Enter] to continue :
Error: Unknown error while running /opt/lampstack-5.4.15-0/php/bin/php -q
/opt/lampstack-5.4.15-0/php/bin/fixreg.php
/opt/lampstack-5.4.15-0/php/lib/php/.registry/.channel.pear.amazonwebservices.com @@BITROCK_PHP_ROOT@@
/opt/lampstack-5.4.15-0/php
Press [Enter] to continue :
Error: Unknown error while running /opt/lampstack-5.4.15-0/php/bin/php -q
/opt/lampstack-5.4.15-0/php/bin/fixreg.php
/opt/lampstack-5.4.15-0/php/lib/php/.registry @@BITROCK_APACHE_ROOTDIR@@
/opt/lampstack-5.4.15-0/apache2
Press [Enter] to continue :
Error: Unknown error while running /opt/lampstack-5.4.15-0/php/bin/php -q
/opt/lampstack-5.4.15-0/php/bin/fixreg.php /opt/lampstack-5.4.15-0/php/etc @@BITROCK_PHP_ROOT@@
/opt/lampstack-5.4.15-0/php
Press [Enter] to continue :
Error: Unknown error while running useradd -r varnish
Press [Enter] to continue :
Error: varnish: Error while executing group action
Press [Enter] to continue :
Warning: Problem running post-install step. Installation may not complete correctly
Unknown error while running chown -R root:daemon
/opt/lampstack-5.4.15-0/frameworks/symfony/app
Press [Enter] to continue :
Warning: Problem running post-install step. Installation may not complete correctly
Unknown error while running chown -R root:daemon
/opt/lampstack-5.4.15-0/frameworks/smarty/sample
Press [Enter] to continue :Warning: Problem running post-install step. Installation may not complete
correctly
Unknown error while running chown -R root:daemon
/opt/lampstack-5.4.15-0/frameworks/laravel/storage/views
Press [Enter] to continue :
Error: Unknown error while running /opt/lampstack-5.4.15-0/ctlscript.sh start apache & > /dev/null
Press [Enter] to continue :
Error: Unable to set the phpmyadmin authorized user
Press [Enter] to continue :
Error: Unknown error while running /opt/lampstack-5.4.15-0/ctlscript.sh restart apache
Press [Enter] to continue :
Warning: Problem running post-install step. Installation may not complete correctly
Unknown error while running chown -R root:daemon
/opt/lampstack-5.4.15-0/apache2/htdocs
Press [Enter] to continue :
----------------------------------------------------------------------------
Setup has finished installing BitNami LAMP Stack on your computer.
Launch BitNami LAMP Stack [Y/n]: n
I can't seem to find any installation log file so unclear how to investigate further. My guess is that it must be something pretty straight forward to fail quite so catastrophically.