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无法从 19.10 升级到 20.04

tag-icon • tag-icon package-management upgrade 20.04
无法从 19.10 升级到 20.04

我尝试使用命令将我的发行版从 19.10 升级到 20.04 update-manager -d。它显示新版本 20.04 可用，我可以升级。当我选择升级选项时，它在终端中给了我以下结果。

Checking for a new Ubuntu release
Checking for a new Ubuntu release
 /usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py:23: PyGIWarning: Gtk was 
 imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import 
 to ensure that the right version gets loaded.
  from gi.repository import Gtk, Gdk
 /usr/lib/python3/dist-packages/DistUpgrade/ReleaseNotesViewerWebkit.py:33: PyGIWarning: WebKit2 
 was imported without specifying a version first. Use gi.require_version('WebKit2', '4.0') 
 before import to ensure that the right version gets loaded.
  from gi.repository import WebKit2 as WebKit
 authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' 
 extracting 'focal.tar.gz'

此后，该过程突然停止，一切恢复原状。我无法进行升级。

编辑：/etc/apt/sources.list 的内容如下图所示 Ubuntu 源代码列表

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