我收到警告
W Failed to fetch http://ppa.launchpad.net/groovy-dev/groovy/ubuntu/dists/trusty/main/binary-amd64/Packages
我的 出了什么问题/etc/apt/sources.list？
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ru.archive.ubuntu.com/ubuntu/ trusty main restricted
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty multiverse main restricted universe #Added by software-properties
## Major bug fix updates produced after the final release of the
## distribution.
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://ru.archive.ubuntu.com/ubuntu/ trusty universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://ru.archive.ubuntu.com/ubuntu/ trusty multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://ru.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse #Added by software-properties
deb http://ru.archive.ubuntu.com/ubuntu/ trusty-security main restricted
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty-security multiverse main restricted universe #Added by software-properties
deb http://ru.archive.ubuntu.com/ubuntu/ trusty-security universe
deb http://ru.archive.ubuntu.com/ubuntu/ trusty-security multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu trusty partner
deb-src http://archive.canonical.com/ubuntu trusty partner
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://ru.archive.ubuntu.com/ubuntu/ trusty-updates restricted main multiverse universe
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty-updates restricted main multiverse universe #Added by software-properties
deb http://ru.archive.ubuntu.com/ubuntu/ trusty-proposed restricted main multiverse universe
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty-proposed restricted main multiverse universe #Added by software-properties
# VirtualBox VBOX
# deb http://download.virtualbox.org/virtualbox/debian trusty contrib # disabled on upgrade to trusty
deb http://archive.canonical.com/ trusty partner
# deb-src http://archive.canonical.com/ trusty partner
答案1
你的文件没有问题/etc/apt/sources.list。
转到/etc/apt/sources.list.d使用
cd /etc/apt/sources.list.d
搜索PPA相关文件groovy-dev并检测然后更新
sudo apt-get update
当该网页不可用时，就会出现 404 错误。
答案2
事实上，没有针对 trusty 的版本：
如果你去
http://ppa.launchpad.net/groovy-dev/groovy/ubuntu/dists/
你会发现trusty缺少了什么。