Another tricky error after Debian squeeze upgrade:
ERROR: Wrong ‘suhosin.session.encrypt’ option value. Read REQUIREMENTS section in INSTALL file or use Roundcube Installer, please!

The fix is very trivial:

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vim /etc/php5/apache2/php.ini
# Add this lines to the bottom of the config:
[suhosin]
suhosin.session.encrypt = Off

Solution for php5-fpm:

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php_admin_value[suhosin.session.encrypt] = Off

To upgrade the database style to roundcube version 0.9.0 I used a little workaround to prevent suhosin error reporting:

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php -d suhosin.session.encrypt=off -d date.timezone=Europe/Berlin bin/updatedb.sh --package=roundcube --version=0.8.2 --dir=`pwd`/SQL