# [Ruby On Rails]解決安裝rvm時遇到的一些問題 ###### tags: `Ruby On Rails`,`rvm` 參考資料: https://progressbar.tw/notes/RubyOnRails/24 https://stackoverflow.com/questions/23650992/ruby-rvm-apt-get-update-error https://askubuntu.com/questions/378558/unable-to-locate-package-while-trying-to-install-packages-with-apt 若是apt-get update有failed的package, 安裝rvm就會遇到問題 解決方式: ```terminal sudo apt-get update | grep "Failed" ``` 可能看到的情形: ```terminal :~# apt-get update | grep "Failed" W: Failed to fetch http://ppa.launchpad.net/upubuntu-com/web/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ppa.launchpad.net/upubuntu-com/web/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. ``` 這時就要把failed的package移除: ```terminal sudo add-apt-repository --remove ppa:{failing ppa} ``` 舉例而言,要移除上面範例中的package: ```terminal sudo add-apt-repository --remove ppa:upubuntu-com/web ``` 另外,也請參考以下連結開啟軟件與更新的設定. https://askubuntu.com/questions/378558/unable-to-locate-package-while-trying-to-install-packages-with-apt https://i.stack.imgur.com/YbDic.png