yum更新后"/usr/bin/yum", line 29, in ?的解决办法

yum的更新方法，可以到网上搜一下，这里不再累述。

我的yum更新后，出现的问题如下所示：

[root@sunss-22 yum.repos.d]# yum search php
================================================================== Matched: php ===================================================================
php-pear.noarch : PHP Extension and Application Repository framework
compat-readline43.i386 : edline 4.3

                                    compat-readline43.x86_64 : edline 4.3

                                                                          fonts-arabic.noarch : gollem-h3.noarch : The Horde web-based File Manager.
hddtemp.x86_64 : Hard disk temperature tool
horde.noarch : The common Horde Framework for all Horde modules.
imp-h3.noarch : The Internet Messaging Program: webmail access to IMAP/POP3 accounts.
ingo-h3.noarch : The Horde web-based Email Filter Rules Manager.
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in ?
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 309, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 178, in main
    result, resultmsgs = base.doCommands()
  File "/usr/share/yum-cli/cli.py", line 349, in doCommands
    return self.yum_cli_commands[self.basecmd].doCommand(self, self.basecmd, self.extcmds)
  File "/usr/share/yum-cli/yumcommands.py", line 627, in doCommand
    return base.search(extcmds)
  File "/usr/share/yum-cli/cli.py", line 813, in search
    self.matchcallback(po, matched_value, args)
  File "/usr/share/yum-cli/output.py", line 818, in matchcallback
    print msg
UnicodeEncodeError: 'gb2312' codec can't encode character u'\ufffd' in position 17: illegal multibyte sequence

试了各种办法：

1.yum clean all

2.修改/etc/yum.conf,

[root@sunss-22 yum.repos.d]# 
[root@sunss-22 yum.repos.d]# cat /etc/yum.conf
[main]
cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
distroverpkg=redhat-release
tolerant=1
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1             #替换为plugins=0

# Note: yum-RHN-plugin doesn't honor this.
metadata_expire=1h

# Default.
# installonly_limit = 3

# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d

3.修改fastestmirror.conf

fastestmirror.conf
[root@sunss-22 pluginconf.d]# cat fastestmirror.conf 
[main]
enabled=1        #替换为enabled=0
verbose=0
socket_timeout=3
hostfilepath=/var/cache/yum/timedhosts.txt
maxhostfileage=10
maxthreads=15
#exclude=.gov, facebook
[root@sunss-22 pluginconf.d]# 

等等，一系列工作都不行，最后解决办法：

#yum clean all
#rm -f /var/lib/rpm/__db*
#rpm --rebuilddb
#yum update