1、升级准备
做好资料备份
2、开始升级
# 更新Ubuntu18 sudo apt get update sudo apt get upgrade sudo apt autoremove # 查看有哪些版本可以升级 sudo do-release-upgrade -c sudo do-release-upgrade -d -c # 升级到Ubuntu20 sudo do-release-upgrade -d # 系统会自动升级，升级后，桌面操作快乐很多 # 现阶段有个问题，就是升级后，桌面快捷方式都不能使用了，不知道怎么回事
3、替换国内源
sudo vi /etc/apt/sources.list deb http://mirrors.163.com/ubuntu/ focal main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ focal main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverse
4、禁用自动更新
# 1都改为0 sudo vi /etc/apt/apt.conf.d/10periodic APT::Periodic::Update-Package-Lists "0"; APT::Periodic::Download-Upgradeable-Packages "0"; APT::Periodic::AutocleanInterval "0"; APT::Periodic::Unattended-Upgrade "0";