ubuntu问题解答集锦

Posted 2020-08-09 zipon

一、su root提示认证失败

1. su root提示认证失败
2. ubuntu root是默认禁用了，不答应用root登陆，所以先要设置root密码。   执行：sudo passwd root 接着输入密码和root密码，重复密码。再重新启动就可以用root登陆。
3. sudo passwd 
   Password: <--- 输入安装时那个用户的密码 
   Enter new UNIX password: <--- 新的Root用户密码 
   Retype new UNIX password: <--- 重复新的Root用户密码 
   passwd：已成功更新密码

二、apt-get update失败原因

　　1. 可能没配置网关vi /etc/resolv.conf    

　　　　　　　　　　　　nameserver 119.29.29.29

　　　　　　　　　　　　nameserver 182.254.116.116

 三、配置静态IP

　　1.　sudo vim /etc/network/interfaces

　　　　修改如下部分：

　　　　auto eth0
　　　　iface eth0 inet static
　　　　address 192.168.0.117
　　　　gateway 192.168.0.1 #这个地址你要确认下 网关是不是这个地址
　　　　netmask 255.255.255.0
　　　　network 192.168.0.0
　　　　broadcast 192.168.0.255

 

四、使用官网的源下载速度很慢，可以使用清华大学、阿里的源

　　　　1.sudo vim /etc/apt/source.list

　　　　　　

# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted
deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse