本文介绍如何在特定环境下移除并重新安装Rmagick gem。首先通过sudo apt-get remove命令卸载可能冲突的软件包，接着安装所需的依赖项libmagick9-dev和ruby1.8-dev，最后使用sudo gem install命令安装Rmagick。
let's undo some of the damage (just in case):
sudo apt-get remove --purge librmagick-ruby-doc librmagick-ruby1.8
Next let's get the version we need:
sudo apt-get install libmagick9-dev ruby1.8-dev
Lastly, go grab rmagick, the gem
sudo gem install rmagick
sudo apt-get remove --purge librmagick-ruby-doc librmagick-ruby1.8
Next let's get the version we need:
sudo apt-get install libmagick9-dev ruby1.8-dev
Lastly, go grab rmagick, the gem
sudo gem install rmagick
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