パッケージマネージャをどのように変更しますか？

私は約1年間Debian 7.0（3.16.0-0.bpo.4-amd64）を実行してきましたが、うまくいきます。

私は昨日1つを作り、apt-get dist-upgradeNginxに少し触れた後、また素晴らしい仕事をしました。ただし、一部の一般的なパッケージ（Debianサイトにあります）に対してパッケージマネージャを使用しようとするたびに、パッケージマネージャを介してそのパッケージをダウンロードすることはできません。

私のソースのリスト：

# 

# deb cdrom:[Debian GNU/Linux 7.0.0 _Wheezy_ - Official amd64 NETINST Binary-1 20130504-14:43]/ wheezy main

#deb cdrom:[Debian GNU/Linux 7.0.0 _Wheezy_ - Official amd64 NETINST Binary-1 20130504-14:43]/ wheezy main

deb http://ftp.nl.debian.org/debian/ wheezy main
deb-src http://ftp.nl.debian.org/debian/ wheezy main

deb http://security.debian.org/ wheezy/updates main
deb-src http://security.debian.org/ wheezy/updates main

# wheezy-updates, previously known as 'volatile'
deb http://ftp.nl.debian.org/debian/ wheezy-updates main
deb-src http://ftp.nl.debian.org/debian/ wheezy-updates main
deb http://ppa.launchpad.net/webupd8team/java/ubuntu precise main
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu precise main
deb http://http.debian.net/debian wheezy-backports main

試しましたが、apt-get cleanまだapt-get update次のパッケージをインストールできませんでした。

 sudo apt-get install python-software-properties
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package python-software-properties is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python-software-properties' has no installation candidate

または、たとえば、次のようになります。

apt-get install spamassassin spamc
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 spamassassin : Depends: libhtml-parser-perl (>= 3.43) but it is not installable
                Depends: libsocket6-perl but it is not installable
                Depends: libsys-hostname-long-perl but it is not installable
                Depends: libwww-perl but it is not installable
                Depends: libnet-dns-perl (>= 0.34) but it is not installable
                Depends: libnetaddr-ip-perl but it is not installable
                Recommends: libmail-spf-perl but it is not installable
                Recommends: re2c but it is not installable
                Recommends: libio-socket-inet6-perl but it is not installable
E: Unable to correct problems, you have held broken packages.

同時に、Debian の Web サイトでは libhtml-parser-perl の上位バージョンを使用できると述べています。 （https://packages.debian.org/wheezy/libhtml-parser-perl）。どうなりますか？この問題をどのように解決できますか？

私のapt-cache policyスパムシーン/依存関係：

apt-cache policy spamassassin
spamassassin:
  Installed: (none)
  Candidate: 3.3.2-5+deb7u3
  Version table:
     3.4.0-2~bpo70+1 0
        100 http://http.debian.net/debian/ wheezy-backports/main amd64 Packages
     3.3.2-5+deb7u3 0
        500 http://ftp.nl.debian.org/debian/ wheezy-updates/main amd64 Packages
     3.3.2-5+deb7u2 0
        -10 http://ftp.nl.debian.org/debian/ wheezy/main amd64 Packages
        -10 http://debian.mirror.iweb.ca/debian/ wheezy/main amd64 Packages
     3.3.2-2~bpo60+1 0
        100 http://backports.debian.org/debian-backports/ squeeze-backports/main amd64 Packages


apt-cache policy libhtml-parser-perl
libhtml-parser-perl:
  Installed: (none)
  Candidate: (none)
  Version table:
     3.69-2 0
        -10 http://ftp.nl.debian.org/debian/ wheezy/main amd64 Packages
        -10 http://debian.mirror.iweb.ca/debian/ wheezy/main amd64 Packages

私のものapt-policy：

Package files:
 100 /var/lib/dpkg/status
     release a=now
 500 http://debian.mirror.iweb.ca/debian/ wheezy/main Translation-en
 -10 http://debian.mirror.iweb.ca/debian/ wheezy/main i386 Packages
     release v=7.8,o=Debian,a=oldstable,n=wheezy,l=Debian,c=main
     origin debian.mirror.iweb.ca
 -10 http://debian.mirror.iweb.ca/debian/ wheezy/main amd64 Packages
     release v=7.8,o=Debian,a=oldstable,n=wheezy,l=Debian,c=main
     origin debian.mirror.iweb.ca
 500 http://backports.debian.org/debian-backports/ squeeze-backports/main Transl                                                              ation-en
 100 http://backports.debian.org/debian-backports/ squeeze-backports/main i386 P                                                              ackages
     release o=Debian Backports,a=squeeze-backports,n=squeeze-backports,l=Debian                                                               Backports,c=main
     origin backports.debian.org
 100 http://backports.debian.org/debian-backports/ squeeze-backports/main amd64                                                               Packages
     release o=Debian Backports,a=squeeze-backports,n=squeeze-backports,l=Debian                                                               Backports,c=main
     origin backports.debian.org
 500 http://downloads-distro.mongodb.org/repo/debian-sysvinit/ dist/10gen i386 P                                                              ackages
     release v=dist,o=mongodb,a=mongodb,n=dist,l=mongodb,c=10gen
     origin downloads-distro.mongodb.org
 500 http://downloads-distro.mongodb.org/repo/debian-sysvinit/ dist/10gen amd64                                                               Packages
     release v=dist,o=mongodb,a=mongodb,n=dist,l=mongodb,c=10gen
     origin downloads-distro.mongodb.org
 500 https://get.docker.com/ubuntu/ docker/main i386 Packages
     release n=docker,c=main
     origin get.docker.com
 500 https://get.docker.com/ubuntu/ docker/main amd64 Packages
     release n=docker,c=main
     origin get.docker.com
 500 http://http.debian.net/debian/ wheezy-backports/main Translation-en
 100 http://http.debian.net/debian/ wheezy-backports/main i386 Packages
     release v=,o=Debian Backports,a=wheezy-backports,n=wheezy-backports,l=Debia                                                              n Backports,c=main
     origin http.debian.net
 100 http://http.debian.net/debian/ wheezy-backports/main amd64 Packages
     release v=,o=Debian Backports,a=wheezy-backports,n=wheezy-backports,l=Debia                                                              n Backports,c=main
     origin http.debian.net
 500 http://ppa.launchpad.net/webupd8team/java/ubuntu/ precise/main Translation-                                                              en
 500 http://ppa.launchpad.net/webupd8team/java/ubuntu/ precise/main i386 Package                                                              s
     release v=12.04,o=LP-PPA-webupd8team-java,a=precise,n=precise,l=Oracle Java                                                               (JDK) 7 / 8 / 9 Installer PPA,c=main
     origin ppa.launchpad.net
 500 http://ppa.launchpad.net/webupd8team/java/ubuntu/ precise/main amd64 Packag                                                              es
     release v=12.04,o=LP-PPA-webupd8team-java,a=precise,n=precise,l=Oracle Java                                                               (JDK) 7 / 8 / 9 Installer PPA,c=main
     origin ppa.launchpad.net
 500 http://ftp.nl.debian.org/debian/ wheezy-updates/main Translation-en
 500 http://ftp.nl.debian.org/debian/ wheezy-updates/main i386 Packages
     release o=Debian,a=oldstable-updates,n=wheezy-updates,l=Debian,c=main
     origin ftp.nl.debian.org
 500 http://ftp.nl.debian.org/debian/ wheezy-updates/main amd64 Packages
     release o=Debian,a=oldstable-updates,n=wheezy-updates,l=Debian,c=main
     origin ftp.nl.debian.org
 500 http://security.debian.org/ wheezy/updates/main Translation-en
 -10 http://security.debian.org/ wheezy/updates/main i386 Packages
     release v=7.0,o=Debian,a=oldstable,n=wheezy,l=Debian-Security,c=main
     origin security.debian.org
 -10 http://security.debian.org/ wheezy/updates/main amd64 Packages
     release v=7.0,o=Debian,a=oldstable,n=wheezy,l=Debian-Security,c=main
     origin security.debian.org
 500 http://ftp.nl.debian.org/debian/ wheezy/main Translation-en
 -10 http://ftp.nl.debian.org/debian/ wheezy/main i386 Packages
     release v=7.8,o=Debian,a=oldstable,n=wheezy,l=Debian,c=main
     origin ftp.nl.debian.org
 -10 http://ftp.nl.debian.org/debian/ wheezy/main amd64 Packages
     release v=7.8,o=Debian,a=oldstable,n=wheezy,l=Debian,c=main
     origin ftp.nl.debian.org
Pinned packages:

私は私についてsources.list何も変えませんでしたsources.list.d。しかしtrusted.gpg.d。