当我尝试从 Ubuntu Gnome 13.10 升级到 Ubuntu 14.04 时，升级应用程序失败并显示以下消息：
Could not calculate the upgrade.
An unresolvable problem occurred while calculating the upgrade.`
这是完整的日志：
$ cat /etc/issue
Ubuntu 13.10 \n \l
$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo do-release-upgrade
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done
Calculating the changes
Calculating the changes
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
This can be …可能的重复：
如何禁止更新特定的包？
在我手动执行之前，我不希望我的内核或 grub 更新。这在 Ubuntu（我想是 10.04）中可行吗？
我对 linux 有点陌生。昨晚我尝试从 13.04 升级到 13.10，但出现“无法计算”错误。我阅读了这个问题并在主日志中发现了这个错误：Dist-upgrade failed: 'E:Unable to纠正问题，你保存了损坏的包。'
这是我损坏的包裹的清单：
Broken libwayland-client0:amd64 Conflicts on libwayland0 [ amd64 ] < 1.0.5-0ubuntu1 > ( libs ) (< 1.1.0)
Broken libpam-systemd:amd64 Conflicts on libpam-xdg-support [ amd64 ] < 0.2-0ubuntu2 > ( admin )
Broken cups-filters:amd64 Conflicts on ghostscript-cups [ amd64 ] < 9.07~dfsg2-0ubuntu3.1 > ( text )
Broken libharfbuzz0a:amd64 Breaks on libharfbuzz0 [ amd64 ] < 0.9.13-1 > ( libs )
Broken libunity-scopes-json-def-desktop:amd64 Conflicts on libunity-common [ amd64 ] < 6.90.2daily13.04.05-0ubuntu1 …我在 Ubuntu 19.10 上，我正在尝试升级到 20.04。不幸的是，升级失败，并显示一条消息，说它“可能因为 Ubuntu 未提供的非官方软件包而失败”（从荷兰语翻译）。
该通知建议使用ppa-purge“从 Launchpad PPA 中删除软件”。它没有指定哪个 PPA，所以我检查了日志文件/var/log/dist-upgrade/20200528-1225/main.log. 在那里我没有看到任何问题。这是完整 main.log 文件的粘贴。我在下面粘贴了日志文件的末尾。
有谁知道我如何解决这个问题以便我可以升级到 20.04？
2019-10-30 16:00:15,624 DEBUG Start checking for obsolete pkgs
2019-10-30 16:00:21,655 DEBUG package 'multiarch-support' produces an unwanted removal 'nextcloud-client', skipping
2019-10-30 16:00:22,705 DEBUG 'multiarch-support' scheduled for remove but not safe to remove, skipping
2019-10-30 16:00:26,392 DEBUG package 'libgnome-keyring0' produces an unwanted removal 'nextcloud-client', skipping
2019-10-30 16:00:27,797 DEBUG 'libgnome-keyring0' scheduled for remove but not safe …