我有 Ubuntu 12.04。但每次我想更新时，它都不起作用。它说，我没有连接到互联网。但这是错误的，我已连接。这是文本：
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/universe/c/chromium-browser/chromium-browser-l10n_24.0.1312.56-0ubuntu0.12.04.1_all.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/universe/c/chromium-browser/chromium-codecs-ffmpeg_24.0.1312.56-0ubuntu0.12.04.1_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/universe/c/chromium-browser/chromium-browser_24.0.1312.56-0ubuntu0.12.04.1_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/l/lightdm/lightdm_1.2.3-0ubuntu1_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/g/gnome-control-center/gnome-control-center-data_3.4.2-0ubuntu0.9_all.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/l/lightdm/liblightdm-gobject-1-0_1.2.3-0ubuntu1_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/u/unity-greeter/unity-greeter_0.2.9-0ubuntu1_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/f/firefox/firefox-globalmenu_18.0.2+build1-0ubuntu0.12.04.1_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/f/firefox/firefox_18.0.2+build1-0ubuntu0.12.04.1_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:archive.canonical.com/ubuntu/pool/partner/a/adobe-flashplugin/adobe-flash-properties-gtk_11.2.202.262-0precise1_amd64.deb 404 Not Found [IP: 91.189.92.191 80]
Failed to fetch http:archive.canonical.com/ubuntu/pool/partner/a/adobe-flashplugin/adobe-flashplugin_11.2.202.262-0precise1_amd64.deb 404 Not Found [IP: 91.189.92.191 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/g/gnome-control-center/libgnome-control-center1_3.4.2-0ubuntu0.9_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/d/deja-dup/deja-dup_22.0-0ubuntu3_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/f/firefox/firefox-branding_18.0.2+build1-0ubuntu0.12.04.1_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/f/firefox/firefox-gnome-support_18.0.2+build1-0ubuntu0.12.04.1_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/f/firefox/firefox-locale-de_18.0.2+build1-0ubuntu0.12.04.1_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/g/gnome-control-center/gnome-control-center_3.4.2-0ubuntu0.9_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/x/xorg-server/xserver-common_1.11.4-0ubuntu10.11_all.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/x/xorg-server/xserver-xorg-core_1.11.4-0ubuntu10.11_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/l/linux-meta/linux-generic_3.2.0.37.45_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/l/linux-meta/linux-image-generic_3.2.0.37.45_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
Failed to fetch http:de.archive.ubuntu.com/ubuntu/pool/main/l/linux-meta/linux-headers-generic_3.2.0.37.45_amd64.deb 404 Not Found [IP: 141.30.13.10 80]
每个“http:”后面都有“//”，但我不允许发布超过 2 个链接，所以我把它去掉了，因为现在它没有被声明为链接。我希望你还能明白我的意思。我还有图片，但我也不允许发布。所以我复制了文本。标题是“下载的数据包已丢失。请检查您的互联网连接。”意思是：下载数据包失败。请检查您的互联网连接。”（我希望翻译正确，我的英语不太好）我希望你能帮助我！我真的很绝望。提前谢谢你！Kathrin
答案1
这可能是因为您使用的是德国镜像。只需转到更新管理器设置，转到“Ubuntu 软件”并更改镜像/服务器。您也可以通过删除“de”来编辑 /etc/apt/sources.list。
这是德语链接：http://blog.fbausch.de/2012/03/17/ubuntu-12-04-repository-probleme/
答案2
正如我们在我的博客文章中看到的那样这里，您可以从终端运行这些命令来修复此问题
wget -O UpdateAptSources.sh http://ideone.com/plain/UgsBel
chmod 555 UpdateAptSources.sh
sudo ./UpdateAptSources.sh