Appearance

Ubuntu Faq ​

do-release-upgrade 之后出现的无官方镜像源的提示 ​

我们为了加速云机的软件更新速度, 常常将三方源更新为清华或者阿里云, 并同时禁用掉官方的源, 于是在升级的时候便会有这样的提示

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done

Invalid package information

After updating your package information, the essential package
'ubuntu-minimal' could not be located. This may be because you have
no official mirrors listed in your software sources, or because of
excessive load on the mirror you are using. See /etc/apt/sources.list
for the current list of configured software sources.
In the case of an overloaded mirror, you may want to try the upgrade
again later.
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done

Invalid package information

After updating your package information, the essential package
'ubuntu-minimal' could not be located. This may be because you have
no official mirrors listed in your software sources, or because of
excessive load on the mirror you are using. See /etc/apt/sources.list
for the current list of configured software sources.
In the case of an overloaded mirror, you may want to try the upgrade
again later.

解决:

在 /etc/apt/sources.list中添加一行

deb http://archive.ubuntu.com/ubuntu bionic universe main
deb http://archive.ubuntu.com/ubuntu bionic universe main

这里的 bionic 根据系统的版本进行不同的命名替换, 然后再运行即可

# do-release-upgrade
# do-release-upgrade

在 Ubuntu 上安装 zeal ​

ZEAL 是一款离线文档浏览器，其灵感来自 OS X平台上的 Dash，目前支持 Window 和 Liunx。基于 QT5。

支持呼出热键。只要按下组合箭 ALT+Space 即可在任何地方显示面板，不用时可以用热键隐藏的系统托盘。

  • 可同时搜索多个文档
  • 不依赖网络
  • GPL 协议开放源码
  • Dash 中的文档都可以在 Zeal 中使用。
# 加入 库
$ add-apt-repository ppa:zeal-developers/ppa
# 更新
$ apt-get update
# 安装
$ apt-get install zeal
# 加入 库
$ add-apt-repository ppa:zeal-developers/ppa
# 更新
$ apt-get update
# 安装
$ apt-get install zeal

在搜索栏中搜索 zeal, 就可以打开,然后把快捷方式放入侧边栏. 输入关键词就可以查找相关的文档内容.

打开配置项, 然后在 Docsets 栏目中下载相关的文档.

image.png