所以基本上问题是我无法更新我的 apt 缓存 (Ubuntu 14.04)。我最近换了国家，从那时起我就有了这个带感叹号的标志。
我尝试更新我的缓存，sudo apt-get update并尝试更改存储库服务器提供商（从设置->软件和更新等）。请注意，当我选择“查找最近的服务器”时，找不到任何服务器。
我尝试改变我的resolv.conf，但情况变得更糟，我的 wlan 也遇到了一些问题。
/etc/apt/sources.list 的内容：
# deb cdrom:[Ubuntu 14.04.2 LTS _Trusty Tahr_ - Release i386 (20150218.1)]/ trusty main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu trusty main restricted
deb-src http://archive.ubuntu.com/ubuntu trusty main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu trusty-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu trusty-updates main restricted
## 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://archive.ubuntu.com/ubuntu trusty universe
deb-src http://archive.ubuntu.com/ubuntu trusty universe
deb http://archive.ubuntu.com/ubuntu trusty-updates universe
deb-src http://archive.ubuntu.com/ubuntu trusty-updates 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://archive.ubuntu.com/ubuntu trusty multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty multiverse
deb http://archive.ubuntu.com/ubuntu trusty-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty-updates 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://archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu trusty-security main restricted
deb-src http://archive.ubuntu.com/ubuntu trusty-security main restricted
deb http://archive.ubuntu.com/ubuntu trusty-security universe
deb-src http://archive.ubuntu.com/ubuntu trusty-security universe
deb http://archive.ubuntu.com/ubuntu trusty-security multiverse
deb-src http://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://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main
deb http://ppa.launchpad.net/wagungs/kali-linux2/ubuntu raring main
# deb-src http://ppa.launchpad.net/wagungs/kali-linux2/ubuntu raring main
deb http://ppa.launchpad.net/wagungs/kali-linux/ubuntu raring main
# deb-src http://ppa.launchpad.net/wagungs/kali-linux/ubuntu raring main
deb http://ppa.launchpad.net/wagungs/kali-linux1/ubuntu raring main
# deb-src http://ppa.launchpad.net/wagungs/kali-linux1/ubuntu raring main
deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
# deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
# deb-src http://security.ubuntu.com/ubuntu trusty-security main
/etc/apt/sources.list.d 的内容：
diesch-testing-trusty.list
diesch-testing-trusty.list.save
dropbox.list
dropbox.list.save
fkrull-deadsnakes-trusty.list
fkrull-deadsnakes-trusty.list.save
gezakovacs-ppa-trusty.list
gezakovacs-ppa-trusty.list.save
google-chrome.list.save
google-talkplugin.list
google-talkplugin.list.save
kali-tools.list
kali-tools.list~
maxthon-browser.list
maxthon-browser.list.save
midori-ppa-trusty.list
midori-ppa-trusty.list.save
mono-xamarin.list
mono-xamarin.list.save
private-ppa.launchpad.net_commercial-ppa-uploaders_slimjet_ubuntu.list
private-ppa.launchpad.net_commercial-ppa-uploaders_slimjet_ubuntu.list.save
spotify.list
spotify.list.save
stebbins-handbrake-releases-trusty.list
stebbins-handbrake-releases-trusty.list.save
strukturag-libde265-trusty.list
strukturag-libde265-trusty.list.save
tualatrix-ppa-trusty.list
tualatrix-ppa-trusty.list.save
ubuntu-desktop-ubuntu-make-trusty.list
ubuntu-desktop-ubuntu-make-trusty.list.save
wine-wine-builds-trusty.list
wine-wine-builds-trusty.list.save
例如 ping google：
PING google.fritz.box (127.0.53.53) 56(84) bytes of data.
64 bytes from 127.0.53.53: icmp_seq=1 ttl=64 time=0.030 ms
64 bytes from 127.0.53.53: icmp_seq=2 ttl=64 time=0.048 ms
64 bytes from 127.0.53.53: icmp_seq=3 ttl=64 time=0.039 ms
64 bytes from 127.0.53.53: icmp_seq=4 ttl=64 time=0.049 ms
64 bytes from 127.0.53.53: icmp_seq=5 ttl=64 time=0.046 ms
64 bytes from 127.0.53.53: icmp_seq=6 ttl=64 time=0.051 ms
^C
--- google.fritz.box ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5000ms
rtt min/avg/max/mdev = 0.030/0.043/0.051/0.011 ms
结果sudo apt-get update：
Αγνόησε https://private-ppa.launchpad.net trusty InRelease
Σφάλμα http://dl.google.com stable InRelease
Σφάλμα http://repository.spotify.com testing InRelease
Σφάλμα http://ppa.launchpad.net raring InRelease
Σφάλμα http://archive.ubuntu.com trusty InRelease
Σφάλμα http://dl.google.com stable Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://repository.spotify.com testing Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://archive.ubuntu.com trusty-updates InRelease
Σφάλμα http://archive.ubuntu.com trusty-backports InRelease
Σφάλμα http://archive.ubuntu.com trusty-security InRelease
Σφάλμα http://ppa.launchpad.net raring InRelease
Σφάλμα http://ppa.launchpad.net raring InRelease
Σφάλμα http://ppa.launchpad.net trusty InRelease
Σφάλμα http://ppa.launchpad.net trusty InRelease
Σφάλμα http://ppa.launchpad.net trusty InRelease
Σφάλμα http://ppa.launchpad.net trusty InRelease
Σφάλμα http://ppa.launchpad.net trusty InRelease
Σφάλμα http://ppa.launchpad.net trusty InRelease
Σφάλμα http://ppa.launchpad.net trusty InRelease
Σφάλμα http://ppa.launchpad.net trusty InRelease
Σφάλμα http://archive.ubuntu.com trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://archive.ubuntu.com trusty-updates Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://archive.ubuntu.com trusty-backports Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty InRelease
Σφάλμα http://ppa.launchpad.net trusty InRelease
Σφάλμα http://ppa.launchpad.net raring Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net raring Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net raring Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://archive.ubuntu.com trusty-security Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://ppa.launchpad.net trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://dl.maxthon.com stable InRelease
Σφάλμα http://download.mono-project.com wheezy InRelease
Σφάλμα http://download.mono-project.com wheezy-apache24-compat InRelease
Σφάλμα http://extras.ubuntu.com trusty InRelease
Σφάλμα http://linux.dropbox.com trusty InRelease
Σφάλμα http://dl.maxthon.com stable Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://extras.ubuntu.com trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://linux.dropbox.com trusty Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://download.mono-project.com wheezy Release.gpg
Unable to connect to 85.73.170.197:3128:
Σφάλμα http://download.mono-project.com wheezy-apache24-compat Release.gpg
Unable to connect to 85.73.170.197:3128:
“Σφάλμα”这个词的意思是错误。
答案1
您的问题出在您的 APT 代理上，如以下消息所示：
Unable to connect to 85.73.170.197:3128
已知端口 3128 是 squid 的默认端口。可能被某些 apt-cacher-ng 使用，...无论如何，很可能是缓存。该端口已无法访问。
无论是在 /etc/apt/apt.conf还是来自的某些文件中/etc/apt/apt.conf.d，您都会有一些Acquire::http::Proxy应该删除的东西。
运行grep -Ri Acquire::http::Proxy /etc/apt，以确认/找到您应该编辑的文件。