MYSQL Error

017-01-22T16:18:06.214161Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2017-01-22T16:18:06.214326Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2017-01-22T16:18:06.536519Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2017-01-22T16:18:06.543467Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.17-0ubuntu0.16.04.1) starting as process 3647 ...
2017-01-22T16:18:06.571026Z 0 [Note] InnoDB: PUNCH HOLE support available
2017-01-22T16:18:06.571095Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2017-01-22T16:18:06.571106Z 0 [Note] InnoDB: Uses event mutexes
2017-01-22T16:18:06.571120Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2017-01-22T16:18:06.571130Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2017-01-22T16:18:06.571139Z 0 [Note] InnoDB: Using Linux native AIO
2017-01-22T16:18:06.571731Z 0 [Note] InnoDB: Number of pools: 1
2017-01-22T16:18:06.571975Z 0 [Note] InnoDB: Using CPU crc32 instructions
2017-01-22T16:18:06.577202Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2017-01-22T16:18:06.625715Z 0 [Note] InnoDB: Completed initialization of buffer pool
2017-01-22T16:18:06.631873Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2017-01-22T16:18:06.647876Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2017-01-22T16:18:06.736500Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2017-01-22T16:18:06.736633Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2017-01-22T16:18:07.143892Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2017-01-22T16:18:07.145163Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2017-01-22T16:18:07.145188Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2017-01-22T16:18:07.150769Z 0 [Note] InnoDB: Waiting for purge to start
2017-01-22T16:18:07.201406Z 0 [Note] InnoDB: 5.7.17 started; log sequence number 16765716
2017-01-22T16:18:07.207484Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2017-01-22T16:18:07.208190Z 0 [Note] InnoDB: Buffer pool(s) load completed at 170122 17:18:07
2017-01-22T16:18:07.208412Z 0 [Note] Plugin 'FEDERATED' is disabled.
2017-01-22T16:18:07.229256Z 0 [Warning] Failed to set up SSL because of the following SSL library error: SSL context is not usable without certificate and private key
2017-01-22T16:18:07.229286Z 0 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306
2017-01-22T16:18:07.229302Z 0 [Note]   - '127.0.0.1' resolves to '127.0.0.1';
2017-01-22T16:18:07.229351Z 0 [Note] Server socket created on IP: '127.0.0.1'.
2017-01-22T16:18:07.230207Z 0 [ERROR] Fatal error: Can't open and lock privilege tables: Incorrect file format 'user'
2017-01-22T16:18:07.230287Z 0 [ERROR] Aborting