ubuntu更新源列表

1. 备份源列表

sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup

 2、修改更新源

打开源列表

sudo gedit /etc/apt/sources.list

 用https://www.cnblogs.com/iamhenanese/p/5514111.html这个网址中的一些源替换

3、最后执行命令

sudo apt-get update

4、Ubuntu更新update源时出现AppStream cache update completed, but some metadata was ignored due to errors。

After that, upgrade to the version from xenial-backports by typing:

sudo apt install appstream/xenial-backports

Now your appstream package should be upgraded to version 0.10.1.

$ appstreamcli --version
AppStream CLI tool version: 0.10.1

Now force refreshing the cache data, you should no longer see any warning:

$ sudo appstreamcli refresh --force
AppStream cache update completed successfully.