最近我的戴尔 XPS 13 笔记本电脑的菜单栏中出现了一个红色警告三角形图标。当我打开菜单时，它告诉我“更新信息已过时”。
我可以选择“检查所有更新”，这将启动一个名为“更新缓存”的窗口。我在下面显示了最终内容，为了便于阅读，我对其进行了美化。
我不知道我的互联网连接是否存在任何问题，并且如果没有互联网连接就无法发布此消息。
我该如何解决这些问题？
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无法下载存储库信息 检查您的互联网连接 v 详细信息
W:GPG error: http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 Release: The following signatures were invalid: KEYEXPIRED 1507497109,
W:The repository 'http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 Release' is not signed.,
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use.,
W:See apt-secure(8) manpage for repository creation and user configuration details.,
注意：我已经升级到 3.6 版本，所以这些数据确实已经过时了。
W:GPG error: http://ftp.debian.org/debian jessie-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010,
W:The repository 'http://ftp.debian.org/debian jessie-backports InRelease' is not signed.,
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use.,
W:See apt-secure(8) manpage for repository creation and user configuration details.,
W:GPG error: http://cdn-fastly.deb.debian.org/debian jessie-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010,
W:The repository 'http://httpredir.debian.org/debian jessie-backports InRelease' is not signed.,
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use.,
W:See apt-secure(8) manpage for repository creation and user configuration details.,
W:The repository 'http://ppa.launchpad.net/fta/gnome3/ubuntu xenial Release' does not have a Release file.,
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use.,
W:See apt-secure(8) manpage for repository creation and user configuration details.,
W:The repository 'http://ppa.launchpad.net/nvbn-rm/ppa/ubuntu xenial Release' does not have a Release file.,
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use.,
W:See apt-secure(8) manpage for repository creation and user configuration details.,
W:The repository 'http://ppa.launchpad.net/vincent-c/nevernote/ubuntu xenial Release' does not have a Release file.,
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use.,
W:See apt-secure(8) manpage for repository creation and user configuration details.,
E:Failed to stat /var/lib/apt/lists/partial/deb.opera.com_opera-stable_dists_stable_InRelease - pkgAcqTransactionItem::TransactionState-stat (2: No such file or directory),
E:Failed to stat /var/lib/apt/lists/partial/deb.opera.com_opera-stable_dists_stable_non-free_binary-amd64_Packages - pkgAcqTransactionItem::TransactionState-stat (2: No such file or directory),
E:Failed to stat /var/lib/apt/lists/partial/deb.opera.com_opera-stable_dists_stable_non-free_binary-i386_Packages - pkgAcqTransactionItem::TransactionState-stat (2: No such file or directory)
答案1
禁用不受支持的更新系统设置软件并更新反向移植！...检查您的存储库。/etc/apt/sources.list
删除 Opera：
sudo apt-get purge opera-stable
sudo apt-get update
sudo apt-get clean
sudo apt-get update
sudo apt-get upgrade
安装 Opera：
sudo apt-get install opera-stable
您正在使用 Xenial，但您的 sources.list 包含 Precise 的链接。Jessie
备份您当前的 sources.list：
sudo mv /etc/apt/sources.list /etc/apt/sources.list.bak
创建新列表https://help.ubuntu.com/community/Repositories/CommandLine
保存并尝试sudo apt-get update