Privilege Tables error

Hey. I'am having a problem with my mysql-server, it did stop working a couple days ago.
I was getting two error messages, the one was about innodb (which is fixed now.) and the one I can't find the root of the problem.

131222 16:45:23 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
131222 16:45:23  InnoDB: Initializing buffer pool, size = 8.0M
131222 16:45:23  InnoDB: Completed initialization of buffer pool
InnoDB: Log scan progressed past the checkpoint lsn 0 37356
131222 16:45:23  InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
InnoDB: Doing recovery: scanned up to log sequence number 0 44233
131222 16:45:23  InnoDB: Starting an apply batch of log records to the database...
InnoDB: Progress in percents: 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87$
InnoDB: Apply batch completed
131222 16:45:24  InnoDB: Started; log sequence number 0 44233
131222 16:45:24 [ERROR] Fatal error: Can't open and lock privilege tables: Can't find file: 'user' (errno: 2)
131222 16:45:24 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

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The mysql user-table is corrupt. Easy fix: backup the database, reinstall mysql