更新管理器问题:下载存储库信息失败

Question

我是这个论坛的新手，不是技术人员，但我喜欢Ubuntu，从12.04开始就一直在使用它。

感谢所有在这里帮忙的人。

自从下载16.04以来，当我使用软件更新程序时，我会收到一条"Failed to download repository information“消息。我做到了

update-manager -d

在终点站，它带着：

/usr/bin/update-manager:28: 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
/usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py:29: PyGIWarning: Dbusmenu was imported without specifying a version first. Use gi.require_version('Dbusmenu', '0.4') before import to ensure that the right version gets loaded.
  from gi.repository import Dbusmenu, Unity
/usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py:29: PyGIWarning: Unity was imported without specifying a version first. Use gi.require_version('Unity', '7.0') before import to ensure that the right version gets loaded.
  from gi.repository import Dbusmenu, Unity

有人能简单地告诉我我需要做什么吗？

感谢你的期待。

编辑：sudo apt update的输出

Get:1 security.ubuntu.com/ubuntu xenial-security InRelease [92.2 kB] 
Hit:2 ppa.launchpad.net/dhor/myway/ubuntu xenial InRelease 
Hit:3 gb.archive.ubuntu.com/ubuntu xenial InRelease 
Get:4 gb.archive.ubuntu.com/ubuntu xenial-updates InRelease [92.2 kB] 
Ign:5 ppa.launchpad.net/mscore-ubuntu/mscore-stable/ubuntu xenial InRelease 
Hit:6 ppa.launchpad.net/noobslab/apps/ubuntu xenial InRelease 
Hit:7 ppa.launchpad.net/rebuntu16/avidemux+unofficial/ubuntu xenial InRelease 
Hit:8 gb.archive.ubuntu.com/ubuntu xenial-backports InRelease 
Ign:9 ppa.launchpad.net/stebbins/handbrake-releases/ubuntu xenial InRelease 
Hit:10 ppa.launchpad.net/webupd8team/tor-browser/ubuntu xenial InRelease 
Err:11 ppa.launchpad.net/mscore-ubuntu/mscore-stable/ubuntu xenial Release 404 Not Found
Err:12 ppa.launchpad.net/stebbins/handbrake-releases/ubuntu xenial Release 404 Not Found Reading package lists... Done 
E: The repository 'ppa.launchpad.net/mscore-ubuntu/mscore-stable/ubuntu xenial Release' does not have a Release file. 
N: Updating from such a repository can't be done securely, and is therefore disabled by default. 
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'ppa.launchpad.net/stebbins/handbrake-releases/ubuntu xenial Release' does not have a Release file. 
N: Updating from such a repository can't be done securely, and is therefore disabled by default. 
N: See apt-secure(8) manpage for repository creation and user configuration details.

Answer 1

要更新您的系统，只需运行：

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade