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更新时出现红色感叹号错误

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更新时出现红色感叹号错误

通知区域出现红色感叹号，
我运行sudo apt-get update终端时的状态如下：

Ign http: //bd.archive.ubuntu.com trusty/universe  Translation-en_US
Fetched 3,826 kB in 54s (70.5 kB/s)
N: Ignoring file 'getdeb.list.bck' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension<br>
W: GPG error: http: //download.opensuse.org ./ Release: The following signatures were invalid: KEYEXPIRED 1436387333
W: Failed to fetch http: //ppa.launchpad.net/disper-dev/ppa/ubuntu/dists/trusty/main/source/Sources  404  Not Found
W: Failed to fetch http: //ppa.launchpad.net/disper-dev/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found
W: Failed to fetch http: //ppa.launchpad.net/disper-dev/ppa/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found   
E: Some index files failed to download. They have been ignored, or old ones used instead.

我该如何继续？

答案1

PPA 不提供 Trusty 及更新版本的软件包。检查此链接。

所以

  • 消除

    无需降级此 PPA 中已安装的软件包

    sudo rm /etc/apt/sources.list.d/disper-dev-ubuntu-ppa*

或者

  • 清除

    如果可能的话，降级此 PPA 中的所有软件包

    sudo apt-get install ppa-purge
sudo ppa-purge ppa:disper-dev/ppa

在那之后

sudo apt-get update

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