相关疑难解决方法(0)

我不知道如何在Ubuntu上安装最新的Ruby.

首先,我使用了默认的Ruby 1.9.3

sudo apt-get install ruby

然后我尝试使用安装2.0版本

sudo apt-get install ruby2.0

我的Ruby版本仍然是"ruby 1.9.3p484(2013-11-22修订版43786)[x86_64-linux])"

我该怎么办？

当我尝试将Flutter 项目构建到IOS 时，它向我显示此错误，我尝试清理并尝试更改项目目录。

Launching lib/main.dart on iPhone 12 Pro Max in debug mode... Running pod install... CocoaPods' output: ?

    [!] Invalid `Podfile` file: [!] Specifying multiple `post_install` hooks is unsupported..

     #  from /Users/eapple/Downloads/codecanyon-IRJuYEQd-delivery-boy-for-multirestaurants-flutter-app/flutter_application/ios/Podfile:43
     #  -------------------------------------------
     #  
     >  post_install do |installer|
     #    installer.pods_project.targets.each do |target|
     #  -------------------------------------------

    /Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.1/lib/cocoapods-core/podfile.rb:301:in `rescue in block in from_ruby'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.1/lib/cocoapods-core/podfile.rb:295:in `block in from_ruby'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.1/lib/cocoapods-core/podfile.rb:50:in `instance_eval'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.1/lib/cocoapods-core/podfile.rb:50:in `initialize'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.1/lib/cocoapods-core/podfile.rb:293:in `new'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.1/lib/cocoapods-core/podfile.rb:293:in `from_ruby'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.1/lib/cocoapods-core/podfile.rb:259:in `from_file'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/config.rb:200:in `podfile'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/command.rb:150:in `verify_podfile_exists!'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/command/install.rb:46:in `run'
    /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/command.rb:52:in `run' …

Ikenna Okpala 推荐了这个.gemrc（我稍微修改了一下）：

---
：详细：真实
:bulk_threshold: 1000
安装：--no-ri --no-rdoc --env-shebang
：来源：
- http://gems.rubyforge.org/
：基准：假
：回溯：假
更新：--no-ri --no-rdoc --env-shebang
:update_sources: 真

我之前没有注意到--env-shebang。我--env-shebang在http://guides.rubygems.org/command-reference/查找了文档：

安装/更新选项：
...
-E, -?-[no-]env-shebang - 重写已安装脚本上的 shebang 行以使用 /usr/bin/env

实际上，为什么这个--env-shebang选项很重要？（我从来没有用过。）

我在我的机器上安装了导轨

红宝石2.3.1

铁轨5.1.4

Ubuntu 16.04 os

在rails安装之后,当我检查rails版本rails -v 它抛出忽略"Some gems list",因为它的扩展没有构建

Ignoring nokogiri-1.8.1 because its extensions are not built.  Try: gem pristine nokogiri --version 1.8.1
Ignoring bindex-0.5.0 because its extensions are not built.  Try: gem pristine bindex --version 0.5.0
Ignoring byebug-9.1.0 because its extensions are not built.  Try: gem pristine byebug --version 9.1.0
Ignoring curb-0.9.4 because its extensions are not built.  Try: gem pristine curb --version 0.9.4
Ignoring executable-hooks-1.3.2 because its extensions are not built.  Try: gem pristine executable-hooks …