我正在尝试使用umake以下命令安装 Android Studio
sudo umake android android-studio
我收到以下错误：
Downloading and installing requirements
| ERROR: W:GPG error: http://download.opensuse.org/repositories/home:/olav-st/xUbuntu_16.04 Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1BE1E8D7A2B5E9D5, W:The repository 'http://download.opensuse.org/repositories/home:/olav-st/xUbuntu_16.04 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., W:The repository 'http://ppa.launchpad.net/texlive-backports/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., E:Failed to fetch http://ppa.launchpad.net/texlive-backports/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found, E:Some index files failed to download. They have been ignored, or old ones used instead.
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| ERROR: Package requirements can't be met: W:GPG error: http://download.opensuse.org/repositories/home:/olav-st/xUbuntu_16.04 Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1BE1E8D7A2B5E9D5, W:The repository 'http://download.opensuse.org/repositories/home:/olav-st/xUbuntu_16.04 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., W:The repository 'http://ppa.launchpad.net/texlive-backports/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., E:Failed to fetch http://ppa.launchpad.net/texlive-backports/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found, E:Some index files failed to download. They have been ignored, or old ones used instead.
我该如何解决这个问题？在 Google 上搜索没有帮助。
umake版本：16.11.1
Ubuntu 16.04.1 LTS 64 位
更新（dgonzalez 回答之后）
我按照你的回答，现在错误从丢失钥匙到密钥已过期：
ERROR: W:The repository 'http://ppa.launchpad.net/texlive-backports/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:GPG error: http://download.opensuse.org/repositories/home:/olav-st/xUbuntu_16.04 Release: The following signatures were invalid: KEYEXPIRED 1445355426, W:The repository 'http://download.opensuse.org/repositories/home:/olav-st/xUbuntu_16.04 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., E:Failed to fetch http://ppa.launchpad.net/texlive-backports/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found, E:Some index files failed to download. They have been ignored, or old ones used instead.
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ERROR: Package requirements can't be met: W:The repository 'http://ppa.launchpad.net/texlive-backports/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:GPG error: http://download.opensuse.org/repositories/home:/olav-st/xUbuntu_16.04 Release: The following signatures were invalid: KEYEXPIRED 1445355426, W:The repository 'http://download.opensuse.org/repositories/home:/olav-st/xUbuntu_16.04 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., E:Failed to fetch http://ppa.launchpad.net/texlive-backports/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found, E:Some index files failed to download. They have been ignored, or old ones used instead.
答案1
似乎您缺少所需软件包的 GPG 密钥。
您看到此问题是因为apt无法找到系统上安装的所需软件包的匹配 GPG 密钥（也许ubuntu-makeppa 添加正确，但是添加签名密钥时出现错误？）。
作为个人建议，我会考虑始终首先使用默认软件渠道，然后仅添加 ppa如果有的话特殊要求）默认软件没有覆盖。
添加/检索 GPG 密钥密钥服务器
您可以检查某个 GPG 密钥是否存在于密钥服务器并自动将其添加到您的系统中。为此，只需在您的终端上运行以下命令：
sudo apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-keys 1BE1E8D7A2B5E9D5
如果该密钥存在，它将被添加到您的系统中，并且您将能够使用进行ubuntu-make安装sudo apt install ubuntu-make。
恢复系统（删除 ppa）
如果没有安装或更改任何软件包，你可以直接删除 ppa（回购）文件和来自 apt 源的条目，在终端上运行以下命令：
sudo rm /etc/apt/sources.list.d/ubuntu-desktop-ubuntu-ubuntu-make-xenial.list*
不过我始终建议最好使用ppa-purge （你可以使用 安装它sudo apt install ppa-purge），除了删除源条目外，它还会删除添加的键并执行所有其他屈膝礼，例如将软件包恢复到主存储库上的对应版本（如果已安装）。
在您的终端上运行此命令以删除并清除ubuntu-make ppa使用ppa-purge：
sudo ppa-purge ppa:ubuntu-desktop/ubuntu-make
提示：您可以使用 bash 自动完成功能来Tab填写 ppa 名称。
希望能帮助到你。