我尝试从 18.04 进行“do-release-upgrade”到 20.04，但升级失败。
Could not calculate the upgrade
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'.
Restoring original system state
Aborting
日志显示：
https://pastebin.com/CFXJ908H （apt.log） https://pastebin.com/EYJGFUU2 （主日志）
对可能出现的问题有什么见解吗？
答案1
对我来说，x11-utils 是个问题。运行以下命令：
sudo apt-get remove x11-utils
sudo do-release-upgrade
你就该完成了。