杜老师说系统：Ubuntu 20.04 LTS 升级 20.10

sudo apt update
sudo apt -y dist-upgrade
sudo apt -y autoremove

注意：上面三个命令的含义依次为检查系统更新、更新软件程序、删除无用软件。

# Default behavior for the release upgrader.

[DEFAULT]
# Default prompting and upgrade behavior, valid options:
#
#  never  - Never check for, or allow upgrading to, a new release.
#  normal - Check to see if a new release is available.  If more than one new
#           release is found, the release upgrader will attempt to upgrade to
#           the supported release that immediately succeeds the
#           currently-running release.
#  lts    - Check to see if a new LTS release is available.  The upgrader
#           will attempt to upgrade to the first LTS release available after
#           the currently-running one.  Note that if this option is used and
#           the currently-running release is not itself an LTS release the
#           upgrader will assume prompt was meant to be normal.
Prompt=normal

注意：用命令 vim /etc/update-manager/release-upgrades 编辑文件，将 lts 设置为 normal。

$ sudo do-release-upgrade

注意：使用上述命令开始升级系统，升级时需下载大量文件，所以用时较久。

升级过程会有操作提示，请根据需要输入 y 或 N。如果在生产环境中操作，有可能需对正在运行的服务进行升级，会有配置文件更新提示，根据提示操作即可，如遇问题，欢迎在评论区与杜老师交流。

升级结束后会提示是否重启系统，输入 y 并回车重启即可。Ubuntu 的升级与 Windows 不同，不需要在开机阶段等待很长时间。