When I'm trying to install MySQL 5.5 community edition on my Ubuntu 10.04 by compiling the source code, I met the following problem:

$ fg % 1
sudo ../bin/mysqld_safe --basedir=/usr/local/mysql_community_5.5/data --user=mysql --defaults-file=/etc/my.cnf  

[sudo] password for linnan:

Sorry, try again. [sudo] password for linnan: 121023 09:26:21
mysqld_safe Can't log to error log and syslog at the same time. Remove all --log-error configuration options for --syslog to take effect.
Internal program error (non-fatal): unknown logging method
'/usr/local/mysql_community_5.5/log/mysql.log' 121023 09:26:21
mysqld_safe Logging to '/var/log/mysql/error.log'.
Internal program error (non-fatal): unknown logging method
'/usr/local/mysql_community_5.5/log/mysql.log' 121023 09:26:22
mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
121023 09:26:23 mysqld_safe mysqld from pid file
/var/lib/mysql/ubuntu.pid ended

It seems that the problem is related to log configuration. I've noticed a bugfix related to this problem: http://bugs.mysql.com/bug.php?id=50083
But I still have no idea how to solve it.

The relative content in /etc/my.cnf:

[mysqld] port = 3306 socket = /tmp/mysql.sock
skip-external-locking key_buffer_size = 384M max_allowed_packet = 1M
table_open_cache = 512 sort_buffer_size = 2M read_buffer_size = 2M
read_rnd_buffer_size = 8M myisam_sort_buffer_size = 64M
thread_cache_size = 8 query_cache_size = 32M
# Try number of CPU's*2 for thread_concurrency thread_concurrency = 8 character-set-server=utf8
[mysqld-safe]
basedir=/usr/local/mysql_community_5.5
datadir=/usr/local/mysql_community_5.5/data

mysqld_safe_syslog.cnf: /etc/mysql/conf.d/mysqld_safe_syslog.cnf:

[mysqld_safe]
syslog