默认源
## Note, this file is written by cloud-init on first boot of an instance ## modifications made here will not survive a re-bundle. ## if you wish to make changes you can: ## a.) add 'apt_preserve_sources_list: true' to /etc/cloud/cloud.cfg ## or do the same in user-data ## b.) add sources in /etc/apt/sources.list.d ## c.) make changes to template file /etc/cloud/templates/sources.list.tmpl # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://ports.ubuntu.com/ubuntu-ports focal main restricted # deb-src http://ports.ubuntu.com/ubuntu-ports focal main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://ports.ubuntu.com/ubuntu-ports focal-updates main restricted # deb-src http://ports.ubuntu.com/ubuntu-ports focal-updates main restricted ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. deb http://ports.ubuntu.com/ubuntu-ports focal universe # deb-src http://ports.ubuntu.com/ubuntu-ports focal universe deb http://ports.ubuntu.com/ubuntu-ports focal-updates universe # deb-src http://ports.ubuntu.com/ubuntu-ports focal-updates universe ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. deb http://ports.ubuntu.com/ubuntu-ports focal multiverse # deb-src http://ports.ubuntu.com/ubuntu-ports focal multiverse deb http://ports.ubuntu.com/ubuntu-ports focal-updates multiverse # deb-src http://ports.ubuntu.com/ubuntu-ports focal-updates multiverse ## N.B. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. deb http://ports.ubuntu.com/ubuntu-ports focal-backports main restricted universe multiverse # deb-src http://ports.ubuntu.com/ubuntu-ports focal-backports main restricted universe multiverse ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. ## This software is not part of Ubuntu, but is offered by Canonical and the ## respective vendors as a service to Ubuntu users. # deb http://archive.canonical.com/ubuntu focal partner # deb-src http://archive.canonical.com/ubuntu focal partner deb http://ports.ubuntu.com/ubuntu-ports focal-security main restricted # deb-src http://ports.ubuntu.com/ubuntu-ports focal-security main restricted deb http://ports.ubuntu.com/ubuntu-ports focal-security universe # deb-src http://ports.ubuntu.com/ubuntu-ports focal-security universe deb http://ports.ubuntu.com/ubuntu-ports focal-security multiverse # deb-src http://ports.ubuntu.com/ubuntu-ports focal-security multiverse
修改国内源
参考：http://mirrors.ustc.edu.cn/help/ubuntu-ports.html
sed -i 's/ports.ubuntu.com/mirrors.ustc.edu.cn/g' /etc/apt/sources.list
修改后：
## Note, this file is written by cloud-init on first boot of an instance ## modifications made here will not survive a re-bundle. ## if you wish to make changes you can: ## a.) add 'apt_preserve_sources_list: true' to /etc/cloud/cloud.cfg ## or do the same in user-data ## b.) add sources in /etc/apt/sources.list.d ## c.) make changes to template file /etc/cloud/templates/sources.list.tmpl # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://mirrors.ustc.edu.cn/ubuntu-ports focal main restricted # deb-src http://mirrors.ustc.edu.cn/ubuntu-ports focal main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://mirrors.ustc.edu.cn/ubuntu-ports focal-updates main restricted # deb-src http://mirrors.ustc.edu.cn/ubuntu-ports focal-updates main restricted ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. deb http://mirrors.ustc.edu.cn/ubuntu-ports focal universe # deb-src http://mirrors.ustc.edu.cn/ubuntu-ports focal universe deb http://mirrors.ustc.edu.cn/ubuntu-ports focal-updates universe # deb-src http://mirrors.ustc.edu.cn/ubuntu-ports focal-updates universe ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. deb http://mirrors.ustc.edu.cn/ubuntu-ports focal multiverse # deb-src http://mirrors.ustc.edu.cn/ubuntu-ports focal multiverse deb http://mirrors.ustc.edu.cn/ubuntu-ports focal-updates multiverse # deb-src http://mirrors.ustc.edu.cn/ubuntu-ports focal-updates multiverse ## N.B. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. deb http://mirrors.ustc.edu.cn/ubuntu-ports focal-backports main restricted universe multiverse # deb-src http://mirrors.ustc.edu.cn/ubuntu-ports focal-backports main restricted universe multiverse ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. ## This software is not part of Ubuntu, but is offered by Canonical and the ## respective vendors as a service to Ubuntu users. # deb http://archive.canonical.com/ubuntu focal partner # deb-src http://archive.canonical.com/ubuntu focal partner deb http://mirrors.ustc.edu.cn/ubuntu-ports focal-security main restricted # deb-src http://mirrors.ustc.edu.cn/ubuntu-ports focal-security main restricted deb http://mirrors.ustc.edu.cn/ubuntu-ports focal-security universe # deb-src http://mirrors.ustc.edu.cn/ubuntu-ports focal-security universe deb http://mirrors.ustc.edu.cn/ubuntu-ports focal-security multiverse # deb-src http://mirrors.ustc.edu.cn/ubuntu-ports focal-security multiverse
更新索引
sudo apt-get update
