I've got same bug on just installed OS. In my case extension dir was without "lfs" suffix - /usr/lib/php5/20090626.
As JazZ wrote before - solution is creation pdo.ini file with link to pdo.so module.
I've got same bug on just installed OS. In my case extension dir was without "lfs" suffix - /usr/lib/ php5/20090626.
As JazZ wrote before - solution is creation pdo.ini file with link to pdo.so module.