设置很快！
0. opera:config 里搜索 fonts，去掉 Enable Core X Fonts 的勾;
1. 使用你心爱的编辑器打开 $OPPATH/share/opera/ini/font.ini
这个文件，注意权限;
如果觉得权限麻烦，就复制一份font.ini到~/.opera，然后就直接修改吧。
2. 找到第 35 行，把 family: 到 =
中间的字段改成你想要的，系统中存在的中文字体，比如我的改成
family:Vera Sans YuanTi=chinese-s try-first ;
3. 保存退出，重新启动 Opera 就可以看到你选择的中文字体的显示效果了;
于是打开编辑~/.scim/config
gedit ~/.scim/config
找到：/FrontEnd/X11/Dynamic = false
改为：/FrontEnd/X11/Dynamic = true
然后重新启动X，在opera中肆意蹂躏了下键盘，暂时没有出现和以前一样突然不能输入的情况。
(不过注意哦，这个方法有个问题上面也说到了：" which is known to
unfortunately break deadkeys usage in European keyboard layouts. ")
－－－－－－－－－－－－－－－－－－－－－－－－－
还在网上搜索到下面几种解决方法：（本人未测试，不知道可行否，直接转过来给大家参考）
Ubuntu 7.10下scim/libx11的bug及解决方法
在7.10版本的Ubuntu中，默认的scim模式改成了XIM。造成在有些程序中无法输入文字，即使是英文字母也不行的bug。我多次在nautilus里遇到该bug。该bug很早就被报告了，只是最近才由于默认设置的改变而更加容易出现了。不过这似乎是libx11库的bug。
launchpad上给出了两种解决办法：
1. 如果不需要使用依赖 libstdc++5库的程序。可以执行
im-switch -s scim-immodule
把scim模式改掉。但是我需要用到java6，acroread这些依赖stdc++5的程序，所以该方法不适合我。
2. 如果不需要使用deadkeys，可以按以下步骤修改：
a. 执行im-switch -s none，使得scim默认不会启动，退出并重登录
b. 修改 ~/.scim/config 文件， 将 /FrontEnd/X11/Dynamic 改为 true
c. 执行im-switch -s scim，使得scim默认启动。
但是我要用deadkeys来输入法文音标字母，所以该方法也不适合我。
于是有人给出了第三种方法，
a. 按照方法2修改设定
b. 安装 scim-uim以及 uim-latin
c. 设置一个复合键(在gnome的键盘选项中)
d. 启动scim，把输入法改为 UIM-Latin
voila!
还有个更简单的方法。既然是libx11的问题，那就应该从源头上解决，治标治本。
添加源
deb http://ppa.launchpad.net/arnegoetje/ubuntu gutsy main restricted
universe multiverse
deb-src http://ppa.launchpad.net/arnegoetje/ubuntu gutsy main restricted
universe multiverse
把libx11库更新即可。
上面那个是参照debian的bug报告：对于ubuntu用户见https://bugs.launchpad.net/ubuntu/+source/scim/+bug/66104
这里还提到了别的方法：
Bug description
In gutsy, the default mode of scim (detemined by im-switch\'s settings
\"scim\") uses XIM mode. This may cause problems in some applications and
make it impossible to input anything, even if you choose the
English/Keyboard input method. This happens most often in nautilus, but is
also seen in gedit, gnome-terminal, etc.
This bug has been around for a long time, it only became more visible
because of the change in the default settings of scim and the Ubuntu
package.
There are two work arounds for this problem:
1. If you do not use any programs linked to libstdc++5 (very few of the
Ubuntu official packages do, one know exception is the fglrx video driver
for ATi cards; but plenty of third-party programs do, such as firefox
downloaded from http://www.mozilla.com, and Adobe\'s PDF reader), you can
use the scim-immodule setting in im-switch. To change the im-switch
setting, just run \"im-switch -s scim-immodule\" command.
2. If you do not use the deadkeys (often seen on European keyboards, and
if you don\'t know what a deadkey is, you are not using it), you can
change scim\'s \"/FrontEnd/X11/Dynamic\" setting. The procedure to change
this setting is:
(a) Set scim not to start automatically (because it\'s useless to change
the configuration file when scim is running) using the command \"im-switch
-s none\". Log out and re-login.
(b) Edit your ~/.scim/config configuration file, change the
/FrontEnd/X11/Dynamic option to true.
(c) Reset scim to start automatically with command \"im-switch -s scim\".
Log out and re-login.
If you are using programs linked to libstdc++5 as well as deadkeys, there
is no known workaround for you. You may try the scim-bridge settings (you
need to install scim-bridge-* packages first), but it\'s not clear whether
it works or not (and I don\'t even know if there is a written scim-bridge
setting for im-switch of not).
This description was updated. View original description.
其实有个很简单的方法，在网页空白地方点右键打开菜单就又可以继续输入啦
按一下alt-tab切换一下，再按alt-tab切换回来也能解决问题。
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