执行sudo do-release-upgrade命令,提示
- 正在计算变更
- 正在计算变更
- 无法计算升级
- An unresolvable problem occurred while calculating the upgrade.
- This was likely caused by:
- * Unofficial software packages not provided by Ubuntu
- Please use the tool 'ppa-purge' from the ppa-purge
- package to remove software from a Launchpad PPA and
- try the upgrade again.
- If none of this applies, then please report this bug using the
- command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
- you want to investigate this yourself the log files in
- '/var/log/dist-upgrade' will contain details about the upgrade.
- Specifically, look at 'main.log' and 'apt.log'.
- 正在恢复原始系统状态
- 中止