ibus输入法问题：
1：centos6.6中System-》Preferences-》input method中设置ibus，点击input method preferences 没有反应；
2：右上角pannel中没有输入法选择。
原因是自己把系统默认的python2.6升级到2.7
解决办法是在terminal中打开/usr/libexec/ibus-ui-gtk，/usr/ bin/ibus-setup，/usr/libexec/ibus-engine-table并把其中到“exec Python”改为“exec python2.6”。
然后安装（安装过直接忽略）：
yum -y install ibus-table
yum -y install ibus-pinyin
centos6.7中System-》Preferences-》input method，选择ibus，然后重启：在root下直接输入reboot
detail:
[root@localhost libexec]# python2
Python 2.7.12 (default, Oct 6 2016, 23:31:29)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
[root@localhost libexec]# python2.6
Python 2.6.6 (r266:84292, May 22 2015, 08:34:51)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-15)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
[willie@localhost Desktop]$ cd /usr/libexec/
[willie@localhost libexec]$ su
Password:
[root@localhost libexec]# chmod +w ibus-ui-gtk
[root@localhost libexec]# chmod +w ibus-engine-table
[root@localhost libexec]# vim ibus-ui-gtk
[root@localhost libexec]# vim ibus-engine-table
[root@localhost libexec]# cd /usr/bin
[root@localhost bin]# chmod +w ibus-setup
[root@localhost bin]# vim ibus-setup
System-》Preferences-》input method-》Select an input method-》Chinese-》Pinyin-》Add-》Close
按键盘Crtl+Shift，发现已经可以使用拼音输入法了。