sudo apt-get update我尝试在 Ubuntu Gnome 14.04 上运行。
结果如下：
Err http://ppa.launchpad.net trusty InRelease
Err http://ppa.launchpad.net trusty InRelease
Err http://ppa.launchpad.net trusty InRelease
Err http://ppa.launchpad.net trusty InRelease
Err http://ppa.launchpad.net trusty InRelease
W: Failed to fetch http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://ppa.launchpad.net/gilir/lubuntu/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://ppa.launchpad.net/kilian/f.lux/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://ppa.launchpad.net/shutter/ppa/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://ppa.launchpad.net/ubuntu-on-rails/ppa/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://ppa.launchpad.net/webupd8team/java/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://ppa.launchpad.net/cassou/emacs/ubuntu/dists/trusty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/chris-lea/node.js/ubuntu/dists/trusty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/diesch/testing/ubuntu/dists/trusty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu/dists/trusty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/gilir/lubuntu/ubuntu/dists/trusty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/kilian/f.lux/ubuntu/dists/trusty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/shutter/ppa/ubuntu/dists/trusty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/ubuntu-on-rails/ppa/ubuntu/dists/trusty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/webupd8team/java/ubuntu/dists/trusty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu/dists/trusty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://archive.canonical.com/dists/trusty/Release.gpg Cannot initiate the connection to archive.canonical.com:80 (2001:67c:1360:8c01::1b). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::1b 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.
运行后的输出如下find /etc/apt -name '*.list' -exec bash -c 'echo -e "\n$1\n"; cat -n "$1"' _ '{}' \;：
/etc/apt/sources_20140408-22:53:08/sources.list.d/webupd8team-java-trusty.list
1 deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
/etc/apt/sources_20140408-22:53:08/sources.list.d/opera.list
1 # This file makes sure that Opera Browser is kept up-to-date
2 # as part of regular system upgrades
3
4 deb http://deb.opera.com/opera/ stable non-free #Opera Browser (final releases)
5
6
7
/etc/apt/sources_20140408-22:53:08/sources.list.d/chris-lea-node_js-trusty.list
1 deb http://ppa.launchpad.net/chris-lea/node.js/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/chris-lea/node.js/ubuntu trusty main
/etc/apt/sources_20140408-22:53:08/sources.list.d/shutter-ppa-trusty.list
1 deb http://ppa.launchpad.net/shutter/ppa/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/shutter/ppa/ubuntu trusty main
/etc/apt/sources_20140408-22:53:08/sources.list.d/tualatrix-ppa-trusty.list
1 deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/tualatrix/ppa/ubuntu trusty main
/etc/apt/sources_20140408-22:53:08/sources.list.d/webupd8team-sublime-text-3-trusty.list
1 deb http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu trusty main
/etc/apt/sources_20140408-22:53:08/sources.list.d/cassou-emacs-trusty.list
1 deb http://ppa.launchpad.net/cassou/emacs/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/cassou/emacs/ubuntu trusty main
/etc/apt/sources_20140408-22:53:08/sources.list.d/gilir-lubuntu-trusty.list
1 deb http://ppa.launchpad.net/gilir/lubuntu/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/gilir/lubuntu/ubuntu trusty main
/etc/apt/sources_20140408-22:53:08/sources.list.d/private-ppa.launchpad.net_commercial-ppa-uploaders_intellij-idea-ce_ubuntu.list
1 deb https://private-ppa.launchpad.net/commercial-ppa-uploaders/intellij-idea-ce/ubuntu precise main #Added by software-center; credentials stored in /etc/apt/auth.conf
/etc/apt/sources_20140408-22:53:08/sources.list.d/google-chrome.list
1 ### THIS FILE IS AUTOMATICALLY CONFIGURED ###
2 # You may comment out this entry, but any other modifications may be lost.
3 deb http://dl.google.com/linux/chrome/deb/ stable main
/etc/apt/sources_20140408-22:53:08/sources.list.d/diesch-testing-trusty.list
1 deb http://ppa.launchpad.net/diesch/testing/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/diesch/testing/ubuntu trusty main
/etc/apt/sources_20140408-22:53:08/sources.list.d/fossfreedom-packagefixes-trusty.list
1 deb http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu trusty main
/etc/apt/sources_20140408-22:53:08/sources.list
1 # deb cdrom:[Ubuntu-GNOME 14.04 LTS _Trusty Tahr_ - Beta amd64 (20140326.1)]/ trusty main multiverse restricted universe
2
3 # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
4 # newer versions of the distribution.
5 deb http://ua.archive.ubuntu.com/ubuntu/ trusty main restricted
6 deb-src http://ua.archive.ubuntu.com/ubuntu/ trusty main restricted
7
8 ## Major bug fix updates produced after the final release of the
9 ## distribution.
10 deb http://ua.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
11 deb-src http://ua.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
12
13 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
14 ## team. Also, please note that software in universe WILL NOT receive any
15 ## review or updates from the Ubuntu security team.
23 ## your rights to use the software. Also, please note that software in
24 ## multiverse WILL NOT receive any review or updates from the Ubuntu
25 ## security team.
26 deb http://ua.archive.ubuntu.com/ubuntu/ trusty multiverse
27 deb-src http://ua.archive.ubuntu.com/ubuntu/ trusty multiverse
28 deb http://ua.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
29 deb-src http://ua.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
30
31 ## N.B. software from this repository may not have been tested as
32 ## extensively as that contained in the main release, although it includes
33 ## newer versions of some applications which may provide useful features.
34 ## Also, please note that software in backports WILL NOT receive any review
35 ## or updates from the Ubuntu security team.
36 deb http://ua.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
37 deb-src http://ua.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
38
39 deb http://security.ubuntu.com/ubuntu trusty-security main restricted
40 deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
41 deb http://security.ubuntu.com/ubuntu trusty-security universe
42 deb-src http://security.ubuntu.com/ubuntu trusty-security universe
43 deb http://security.ubuntu.com/ubuntu trusty-security multiverse
44 deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse
45
46 ## Uncomment the following two lines to add software from Canonical's
47 ## 'partner' repository.
48 ## This software is not part of Ubuntu, but is offered by Canonical and the
49 ## respective vendors as a service to Ubuntu users.
50 # deb http://archive.canonical.com/ubuntu trusty partner
51 # deb-src http://archive.canonical.com/ubuntu trusty partner
52
53 ## This software is not part of Ubuntu, but is offered by third-party
54 ## developers who want to ship their latest software.
55 deb http://extras.ubuntu.com/ubuntu trusty main
56 deb http://archive.canonical.com/ trusty partner
57 # deb-src http://archive.canonical.com/ trusty partner
58 deb-src http://extras.ubuntu.com/ubuntu trusty main
/etc/apt/sources.list.d/webupd8team-java-trusty.list
1 deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
/etc/apt/sources.list.d/opera.list
1 # This file makes sure that Opera Browser is kept up-to-date
2 # as part of regular system upgrades
3
4 deb http://deb.opera.com/opera/ stable non-free #Opera Browser (final releases)
5
6
7
/etc/apt/sources.list.d/typesafe-apt.list
1 # Typesafe repository.
2 deb http://apt.typesafe.com/ unicorn main # Typesafe "unicorn" releases.
/etc/apt/sources.list.d/chris-lea-node_js-trusty.list
1 deb http://ppa.launchpad.net/chris-lea/node.js/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/chris-lea/node.js/ubuntu trusty main
3 # deb-src http://ppa.launchpad.net/chris-lea/node.js/ubuntu trusty main
/etc/apt/sources.list.d/kilian-f_lux-trusty.list
1 deb http://ppa.launchpad.net/kilian/f.lux/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/kilian/f.lux/ubuntu trusty main
/etc/apt/sources.list.d/ubuntu-on-rails-ppa-trusty.list
1 deb http://ppa.launchpad.net/ubuntu-on-rails/ppa/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/ubuntu-on-rails/ppa/ubuntu trusty main
/etc/apt/sources.list.d/shutter-ppa-trusty.list
1 deb http://ppa.launchpad.net/shutter/ppa/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/shutter/ppa/ubuntu trusty main
/etc/apt/sources.list.d/tualatrix-ppa-trusty.list
1 # deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/tualatrix/ppa/ubuntu trusty main
/etc/apt/sources.list.d/webupd8team-sublime-text-3-trusty.list
1 deb http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu trusty main
/etc/apt/sources.list.d/cassou-emacs-trusty.list
1 deb http://ppa.launchpad.net/cassou/emacs/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/cassou/emacs/ubuntu trusty main
/etc/apt/sources.list.d/gilir-lubuntu-trusty.list
1 deb http://ppa.launchpad.net/gilir/lubuntu/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/gilir/lubuntu/ubuntu trusty main
/etc/apt/sources.list.d/private-ppa.launchpad.net_commercial-ppa-uploaders_intellij-idea-ce_ubuntu.list
1 deb https://private-ppa.launchpad.net/commercial-ppa-uploaders/intellij-idea-ce/ubuntu precise main #Added by software-center; credentials stored in /etc/apt/auth.conf
/etc/apt/sources.list.d/google-chrome.list
1 ### THIS FILE IS AUTOMATICALLY CONFIGURED ###
2 # You may comment out this entry, but any other modifications may be lost.
3 deb http://dl.google.com/linux/chrome/deb/ stable main
/etc/apt/sources.list.d/diesch-testing-trusty.list
1 deb http://ppa.launchpad.net/diesch/testing/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/diesch/testing/ubuntu trusty main
/etc/apt/sources.list.d/fossfreedom-packagefixes-trusty.list
1 deb http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu trusty main
2 # deb-src http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu trusty main
/etc/apt/sources.list.d/mongo.list
1 ##10gen package location
2
3 deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen
/etc/apt/sources.list
20
21 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
22 ## team, and may not be under a free licence. Please satisfy yourself as to
23 ## your rights to use the software. Also, please note that software in
24 ## multiverse WILL NOT receive any review or updates from the Ubuntu
25 ## security team.
26 deb http://ua.archive.ubuntu.com/ubuntu/ trusty multiverse
27 deb-src http://ua.archive.ubuntu.com/ubuntu/ trusty multiverse
28 deb http://ua.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
29 deb-src http://ua.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
30
31 ## N.B. software from this repository may not have been tested as
32 ## extensively as that contained in the main release, although it includes
33 ## newer versions of some applications which may provide useful features.
34 ## Also, please note that software in backports WILL NOT receive any review
35 ## or updates from the Ubuntu security team.
36 deb http://ua.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
37 deb-src http://ua.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
38
39 deb http://security.ubuntu.com/ubuntu trusty-security main restricted
40 deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
41 deb http://security.ubuntu.com/ubuntu trusty-security universe
42 deb-src http://security.ubuntu.com/ubuntu trusty-security universe
43 deb http://security.ubuntu.com/ubuntu trusty-security multiverse
44 deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse
45
46 ## Uncomment the following two lines to add software from Canonical's
47 ## 'partner' repository.
48 ## This software is not part of Ubuntu, but is offered by Canonical and the
49 ## respective vendors as a service to Ubuntu users.
50 # deb http://archive.canonical.com/ubuntu trusty partner
51 # deb-src http://archive.canonical.com/ubuntu trusty partner
52
53 ## This software is not part of Ubuntu, but is offered by third-party
54 ## developers who want to ship their latest software.
55 deb http://extras.ubuntu.com/ubuntu trusty main
56 deb http://archive.canonical.com/ trusty partner
57 # deb-src http://archive.canonical.com/ trusty partner
58 deb-src http://extras.ubuntu.com/ubuntu trusty main
如何解决这个烦恼呢？
答案1
您是否尝试过更改 Ubuntu 下载更新的服务器。
以下是操作方法。请按照以下步骤操作：
软件和更新 → Ubuntu 软件（标签）→ 下载自：
将服务器更改为任何其他可用的服务器。