0. if upgraded from dapper to edgy by "apt-get dist-upgrade", X will fail.
   You have to install the xserver-xorg-core.
   If ati, install xserver-xorg-video-ati...

1. firefox 2.0 crashed with flashplugin-nonfree (flashplayer plugin 9.0)
or flashplayer-mozilla packages are installed, whenever you visit a site with any Flash content, firefox crashes. Below is my printout from console.
http://freesf.tw/modules/news/article.php?storyid=3030&com_id=11350&com_rootid=11278&#comment11350
如果曉得如何從bz2檔案去安裝gcin，則可從「 http://cle.linux.org.tw/gcin/download/ 」安裝gcin-1.3.3.pre4.tar.bz2(或以上版本)；因此版本已解決和Flash 9相衝的問題。謝謝。
   ref: https://launchpad.net/distros/ubuntu/+source/flashplugin-nonfree/+bug/68086
   Adobe最近release flash player 9.0
   因為它會和ubuntu 6.10中的gcin相衝突(註debian中的xcin也會相衝)，所以要做以下步驟:
   (1). 如果你的firefox已經安裝的flash player 9.0，然後一開起來馬上就crash，那請先移除flash player的檔案
                  rm -f ~/.mozilla/plugins/*flash*.so
   (2). 編輯/etc/apt/sources.lst，加入以下兩行
   ----------------------------
   deb http://free.nchc.org.tw/ubuntu edgy-backports main restricted universe multiverse
   deb http://www.calno.com unstable main
   ----------------------------
									       (3). apt-get update; apt-get install gcin flashplugin-nonfree
									             (4). 登出再登入，或者乾脆重新開機

2. ref:
   http://www.ubuntu.org.tw/modules/newbb/viewtopic.php?topic_id=2388&forum=2&post_id=9247#forumpost9247
   02.螢火飛新宋簡易安裝法
   執行指令：安裝字型，並做好設定
   wget -c http://easylinux.info/uploads/fireflysung-1.3.0.tar.gz
   sudo tar zxvf fireflysung-1.3.0.tar.gz
   sudo cp fireflysung-1.3.0/fireflysung.ttf /usr/share/fonts/truetype/
   sudo cp /etc/fonts/conf.d/ttf-arphic-uming /etc/fonts/conf.d/ttf-arphic-newsung.conf
   sudo cp /usr/share/language-selector/fontconfig/zh_TW /usr/share/language-selector/fontconfig/zh_TW_backup
   sudo sed -i -e 's/AR PL ShanHeiSun Uni/AR PL New Sung/' /etc/fonts/conf.d/ttf-arphic-newsung.conf
   sudo sed -i -e 's/AR PL ShanHeiSun Uni/AR PL New Sung/' /usr/share/language-selector/fontconfig/zh_TW
   sudo fc-cache -f -v

3. 完全重新安裝後找不到中文字型
   也許需要重新把uming.ttf, kai.ttf等link到某些字體的目錄，然後
   sudo dpkg-reconfigure x-ttcidfont-conf
   sudo dpkg-reconfigure fontconfig