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Upon checking the logs, we can see the following entries.
Logs: roundcube db not existing
150114 7:53:13 InnoDB: Error: io_setup() failed with EAGAIN after 5 attempts.
InnoDB: You can disable Linux Native AIO by setting innodb_use_native_aio = 0 in my.cnf
Step1: open the file /etc/my.cnf and add the below line,
innodb_use_native_aio = 0
Step2: Restart mysql service
service mysqld restart
Step3: Reinstall roundcube