1、更换源配置，将原来配置文件作备份

sudo mv /etc/apt/sources.list /etc/apt/sources.list_bak
sudo vi /etc/apt/sources.list

2、将源文件中写入如下源

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

3、更新包，更新源

sudo apt update
sudo apt upgrade

4、可能会出现下面固件缺失信息，并解决

问题：

W: Possible missing firmware /lib/firmware/rtl_nic/rtl8125a-3.fw for module r8169

解决：

首先切换目录：
cd /lib/firmware/rtl_nic/
其次执行下面语句：
sudo wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/rtl_nic/rtl8125a-3.fw

问题：

W: Possible missing firmware /lib/firmware/rtl_nic/rtl8168fp-3.fw for module r8169

解决：

首先切换目录：
cd /lib/firmware/rtl_nic/
其次执行下面语句：
sudo wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/rtl_nic/rtl8168fp-3.fw

最后

以上就是孤独金针菇为你收集整理的ubuntu18.04安装后，更换源1、更换源配置，将原来配置文件作备份2、将源文件中写入如下源3、更新包，更新源4、可能会出现下面固件缺失信息，并解决的全部内容，希望文章能够帮你解决ubuntu18.04安装后，更换源1、更换源配置，将原来配置文件作备份2、将源文件中写入如下源3、更新包，更新源4、可能会出现下面固件缺失信息，并解决所遇到的程序开发问题。

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