I use CQRLOG 1.9.0 with Ubuntu 14.04LTS, it worked fine until yesterday.
Now I get a message "Error during connection to database: Server connect failed." and then "MySQL could not be started, please check if the MySQL server is installed properly."
Doing:
piero@IK1IYU-PC:~$ mysqladmin -u root -p status
Uptime: 7033 Threads: 1 Questions: 158 Slow queries: 0 Opens: 64 Flush tables: 1 Open tables: 57 Queries per second avg: 0.022
piero@IK1IYU-PC:~$

MySQL appears to be running...

This is the mysql.err file:

150519 16:43:23 [Note] Plugin 'FEDERATED' is disabled.
150519 16:43:23 InnoDB: The InnoDB memory heap is disabled
150519 16:43:23 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150519 16:43:23 InnoDB: Compressed tables use zlib 1.2.8
150519 16:43:23 InnoDB: Using Linux native AIO
150519 16:43:23 InnoDB: Initializing buffer pool, size = 80.0M
150519 16:43:23 InnoDB: Completed initialization of buffer pool
150519 16:43:23 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
150519 16:43:23 InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
150519 16:43:23 InnoDB: Operating system error number 13 in a file operation.
InnoDB: The error means mysqld does not have the access rights to
InnoDB: the directory.
InnoDB: File name .
InnoDB: File operation call: 'opendir'.
InnoDB: Cannot continue operation.
150519 16:43:42 [Note] Plugin 'FEDERATED' is disabled.
150519 16:43:42 InnoDB: The InnoDB memory heap is disabled
150519 16:43:42 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150519 16:43:42 InnoDB: Compressed tables use zlib 1.2.8
150519 16:43:42 InnoDB: Using Linux native AIO
150519 16:43:42 InnoDB: Initializing buffer pool, size = 80.0M
150519 16:43:42 InnoDB: Completed initialization of buffer pool
150519 16:43:42 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
150519 16:43:42 InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
150519 16:43:42 InnoDB: Operating system error number 13 in a file operation.
InnoDB: The error means mysqld does not have the access rights to
InnoDB: the directory.
InnoDB: File name .
InnoDB: File operation call: 'opendir'.
InnoDB: Cannot continue operation.

Please help!

Piero, IK1IYU