我一直在尝试更新我的显卡，我在英特尔网站上找到了一个 .deb 包，它可以帮助你保持显卡的更新。然而，在运行它时，我不断收到与我在终端中看到的相同的错误：
W: The repository 'http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu xenial
Release' does not have a Release file. N: Data from such a repository
can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user
configuration details.
W: GPG error:
https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease: The
following signatures couldn't be verified because the public key is
not available: NO_PUBKEY 56A3DEF863961D39
W: The repository
'https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease' is
not signed. N: Data from such a repository can't be authenticated and
is therefore potentially dangerous to use. N: See apt-secure(8)
manpage for repository creation and user configuration details. W:
http://www.openprinting.org/download/printdriver/debian/dists/lsb3.2/Release.gpg:
Signature by key F8897B6F00075648E248B7EC24CBF5474CFD1E2F uses weak
digest algorithm (SHA1)
E: Failed to fetch
http://ppa.launchpad.net/ubuntu-x-swat/x-updates/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.
有什么方法可以解决这个问题？我需要删除这些文件还是尝试再次下载它们？
答案1
问题＃1：您定义了不正确的存储库。更改
deb http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu xenial main 到 deb http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu trusty main 或者更好的是，使用他们的直接位置： deb https://download.01.org/gfx/ubuntu/16.04/main xenial main
问题 #2:您没有安装 GPG 密钥。在终端中输入
wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg-4 -O - | \ sudo apt-key add - （包括结尾的连字符）
更多信息请访问他们的网站https://01.org/linuxgraphics/downloads/intel-graphics-update-tool-linux-os-v2.0.2。
干杯，艾尔