问题:安装gcc 或g++ 时提示未发现软件包?
1.这时,只需更新apt-get即可,那么apt-get是什么呢?
apt-get,是一条linux命令,适用于deb包管理式的操作系统,主要用于自动从互联网的软件仓库中搜索、安装、升级、卸载软件或操作系统。
输入命令:sudo apt-get update
如果更新时出现卡顿或很慢,是由于我们用的是外网,或者我们电脑的网络过慢
对于前者我的建议是换源
2.什么原因造成的呢?
因为我们安装好ubuntu双系统\单系统后,默认的软件更新源是国外的,
我们可以打开源目录看看:
先切换到目录:
cd /etc/apt
查看/编辑目录:
sudo vi sources.list
我们可以发现:里面的源都是关于cn.archive.ubuntu.com
这个就是国外的软件更新源
3.怎么解决呢?
国外的软件更新源在国内使用速度很慢,需要更换成国内的源,这样才能正常安装和更新软件。
怎么更换呢?
打开终端命令行界面中,先将sources.list文件备份一个,更新源服务器地址就是存在这个文件里面的,所以主要就是对这个文件进行编辑就可以了,也是很简单的。
1.先切换到目录:cd /etc/apt
2.备份源(防止意外或后续需要)
输入:sudo cp sources.list sources.list.old
3.编辑源:sudo vim sources.list
4.将文件中内容全部删除
5.更换源,有一下几种源可以选择,推荐阿里云
(1)、阿里云
deb http:
deb http:
deb http:
deb http:
deb http:
deb-src http:
deb-src http:
deb-src http:
deb-src http:
deb-src http:
(2)、清华大学
deb https:
deb-src https:
deb https:
deb-src https:
deb https:
deb-src https:
deb https:
deb-src https:
deb https:
deb-src https:
(3)、中科大
deb http:
deb http:
deb http:
deb http:
deb http:
deb-src http:
deb-src http:
deb-src http:
deb-src http:
deb-src http:
6、复制其中一种粘贴完后,要对照一下,有没有粘贴格式的错误或缺了哪些东西,然后保存退出。最后别忘了更新缓存。
输入:sudo apt-get update
更新缓存需要一点时间,更新完就可以了。
执行sudo apt-get update
后续出现的问题,如没出现请忽略:
如输入:sudo apt-get update
后出现这些信息
W: Unknown Multi-Arch type 'no' for package 'compiz-core'
W: Unknown Multi-Arch type 'no' for package 'compiz-gnome'
W: Unknown Multi-Arch type 'no' for package 'libxapian-dev'
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-min
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-min
W: Unknown Multi-Arch type 'no' for package 'kwin'
W: Unknown Multi-Arch type 'no' for package 'kwin-dev'
W: Unknown Multi-Arch type 'no' for package 'kwin-wayland'
W: Unknown Multi-Arch type 'no' for package 'kwin-x11'
W: Unknown Multi-Arch type 'no' for package 'libkf5sysguard-dev'
W: Ignoring Provides line with DepCompareOp for package php-psr-http-message-implementation
W: Ignoring Provides line with DepCompareOp for package php-psr-log-implementation
W: Ignoring Provides line with DepCompareOp for package php-seclib
W: Ignoring Provides line with DepCompareOp for package php-sabre-http
W: Ignoring Provides line with DepCompareOp for package php-math-biginteger
W: Ignoring Provides line with DepCompareOp for package pypy-cffi
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min
W: Unknown Multi-Arch type 'no' for package 'compiz-core'
W: Unknown Multi-Arch type 'no' for package 'compiz-gnome'
W: Unknown Multi-Arch type 'no' for package 'libxapian-dev'
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-min
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-min
W: Unknown Multi-Arch type 'no' for package 'kwin-dev'
W: Unknown Multi-Arch type 'no' for package 'kwin-wayland'
W: Unknown Multi-Arch type 'no' for package 'kwin-x11'
W: Unknown Multi-Arch type 'no' for package 'libkf5sysguard-dev'
W: Ignoring Provides line with DepCompareOp for package pypy-cffi
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min
W: Unknown Multi-Arch type 'no' for package 'compiz-core'
W: Unknown Multi-Arch type 'no' for package 'compiz-gnome'
W: Ignoring Provides line with DepCompareOp for package xserver-xorg
W: Ignoring Provides line with DepCompareOp for package php-math-biginteger
W: Ignoring Provides line with DepCompareOp for package pypy-cffi
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min
W: Unknown Multi-Arch type 'no' for package 'compiz-core'
W: Unknown Multi-Arch type 'no' for package 'compiz-gnome'
W: Ignoring Provides line with DepCompareOp for package xserver-xorg
W: Ignoring Provides line with DepCompareOp for package pypy-cffi
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min
W: 您可能需要运行 apt-get update 来解决这些问题
怎么办呢?
执行如下命令:sudo apt-get install -f apt
再次输入:sudo apt-get update
OK,问题解决
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