Done Package couchdb is not available, but is referred to by another package.    结合例子手把手教你函数的定义、使用、递归等知识 Same for Synaptic.. apt-cache search x seems to show many results for basic searches so why not for these 2 popular package managers? LQ Guru . 【综合项目实战-学生管理系统】    详细讲解C语言基础语法和多种常用数据类型 host , uri . 平均归一化滤波器组 这个是出自那篇论文, 自学零基础入门新版C语言视频教程是2020年2月录制,分为14章72集    深入浅出C语言编译预处理、理解宏、包含文件、条件编译等 This is what I get no matter what package I try to install, as below: This is what I get no matter what package I try to install, as below: I'm running Debian Lenny and apt-get install has been working fine for months.    玩转C语言文件操作之文件的打开关闭、删除、读写 Not every package listed on the command line has to be installed; you can tell aptitude to do something different with a package by appending an “override specifier” to the name of the package. 在学会各中查询语句之后,会带你学习数据的完整性, 掌握如果正确的向数据库中添加数据 Package python is not available, but is referred to by another package. If your paperclip version is 5.1.0 then we are using 'aws-sdk' version 2.3. Need to get 0 B of archives. No candidate version found for metasploit-framework No packages will be installed, upgraded, or removed. It can help in many ways to establish and run a successful business with very little efforts and money. E: package synaptic has no installation candidate Also for some reason I guess I don't have web access outside terminal and the desktop looks sucky like a 1990 operating sytem so I guess there is another problem with screen drivers maybe. E: Package 'linux-headers-generic' has no installation candidate. HOW TO USE CURL ON RUBY ON RAILS? It should look something like this: class VimeoUploader < CarrierWave::Uploader::Base       storage :file end If we want to upload video or image then we will have to use :- class VimeoUploader < CarrierWave::Uploader::Base       include CarrierWave::MiniMagick       include CarrierWave::Video       include CarrierWave::Video::Thumbnailer       include CarrierWave::FFmpeg       storage :file          de, Country State Select is a library that provides an easy API to generate Country , State / Province and City dropdowns for use in forms. I haven't changed my sources list after installing, could something in the sources cause this? This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package has no installation candidate Done Package msttcorefonts is not available, but is referred to by another package. E: package has no installation candidate Linux is no doubt a great operating system. 方法2很好用,不知道为啥,方法1只有在设置了 `LC_ALL` 为 en_US.UTF-8 才有用, https://blog.csdn.net/TH_NUM/article/details/103966244, python 报错Microsoft Visual C++ 14.0 is required, pip安装报错:is not a supported wheel on this platform, Python3中遇到UnicodeEncodeError: 'ascii' codec can't encode characters in ordinal not in range(128).    掌握C语言共用体、枚举、结构体、链表等数据类型的使用 So, we can easily find the ruby path using :- passenger - config -- ruby - command When we run then we will get like :-   Command: /home/rohit/.rvm/gems/ruby -2.1.10/wrappers/ruby   Version: ruby 2.1.10p492 (2016-04-01 revision 54464) [x86_64-linux]   To use in Apache : PassengerRuby /home/rohit/.rvm/gems/ruby -2.1.10/wrappers/ruby   To use in Nginx : passenger_ruby /home/rohit/.rvm/gems/ruby -2.1.10/wrappers/ruby   To use with Standalone: /home/rohit/.rvm/gems/ruby -2.1.10/wrappers/ruby /usr/bin/passenger start Add that line in passenger.conf file, WHEN WE ENTER , SHOW LINE NUMBER IN TEXT AREA HTML PAGE:- <%= text_area_tag :query_editor, '' :name => "query_editor", :class => "add_query_editor" %>