Code:
bt Desktop # mysqld_safe --user=mysql &
[2] 20416
bt Desktop # nohup: ignoring input and redirecting stderr to stdout
Starting mysqld daemon with databases from /var/lib/mysql
STOPPING server from pid file /var/lib/mysql/bt.pid
080107 13:54:57  mysqld ended
bt Desktop # cat /var/lib/mysql/bt.err


Code:
080107 13:54:57  mysqld started
nohup: ignoring input
080107 13:54:57  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...
080107 13:54:57  InnoDB: Starting log scan based on checkpoint at
InnoDB: log sequence number 0 36808.
InnoDB: Doing recovery: scanned up to log sequence number 0 43655
080107 13:54:57  InnoDB: Starting an apply batch of log records to the database...
InnoDB: Progress in percents: 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 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 88 89 90 91 92 93 94 95 96 97 98 99
InnoDB: Apply batch completed
080107 13:54:57  InnoDB: Started; log sequence number 0 43655
080107 13:54:57 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
080107 13:54:57  mysqld ended
080107 13:54:57 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
tell me how to fix this bug ,please