打开ubuntu 或 windows terminal，运行命令do-release-upgrade。
frank@laptop-0ocjtgjr:~$ do-release-upgrade checking for a new ubuntu release there is no development version of an lts available. to upgrade to the latest non-lts develoment release set prompt=normal in /etc/update-manager/release-upgrades.
sudo vi /etc/update-manager/release-upgrades
# default behavior for the release upgrader. [default] # default prompting 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=lts prompt=normal
checking package manager reading package lists... done building dependency tree reading state information... done calculating the changes calculating the changes do you want to start the upgrade? 40 packages are going to be removed. 424 new packages are going to be installed. 690 packages are going to be upgraded. you have to download a total of 547 m. this download will take about 6 minutes with your connection. installing the upgrade can take several hours. once the download has finished, the process cannot be canceled. continue [yn] details [d]y