我正在尝试运行apt-get dist-upgrade，但出现以下错误
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Failed
The following packages have unmet dependencies:
perl : Depends: perl-base (= 5.14.2-21+deb7u2) but it is not going to be installed
Depends: perl-modules (>= 5.14.2-21+deb7u2) but it is not going to be installed
sysvinit : PreDepends: initscripts (>= 2.88dsf-13.3) but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
我成功跑了apt-get upgrade，所以我没主意了
我正在考虑apt-get remove perl，但后来出现了这个错误
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:
mount : PreDepends: libblkid1 (>= 2.20.1) but it is not going to be installed
PreDepends: libmount1 (>= 2.20.1) but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
我的sources.list样子是这样的
deb http://ftp.dk.debian.org/debian/ wheezy main
deb-src http://ftp.dk.debian.org/debian/ wheezy main
deb http://security.debian.org/ testing/updates main
deb-src http://security.debian.org/ testing/updates main
deb http://security.debian.org/debian-security wheezy/updates main
deb-src http://security.debian.org/debian-security wheezy/updates main
deb http://backports.debian.org/debian-backports squeeze-backports main
deb http://mirrors.sunsite.dk/debian/ wheezy main
deb-src http://mirrors.sunsite.dk/debian/ wheezy main
deb http://ftp.ie.debian.org/debian/ wheezy main
deb-src http://ftp.ie.debian.org/debian/ wheezy main
deb http://security.debian.org/ stable/updates main
deb http://ftp.debian.org/debian/ wheezy main non-free
deb http://security.debian.org/ wheezy/updates main non-free
我能做些什么？
评论中问题的答案是
的输出cat /etc/debian_version是7.9，但不，我没有使用，因为你的评论是第一个地方，我读到了它，但我要在运行apt pinning时进行设置apt
的输出apt-cache policy是
Package files:
100 /var/lib/dpkg/status
release a=now
500 http://security.debian.org/ wheezy/updates/non-free Translation-en
500 http://security.debian.org/ wheezy/updates/main Translation-en
500 http://security.debian.org/ wheezy/updates/non-free i386 Packages
release v=7.0,o=Debian,a=oldstable,n=wheezy,l=Debian-Security,c=non-free
origin security.debian.org
500 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
500 http://ftp.debian.org/debian/ wheezy/non-free Translation-en
500 http://ftp.debian.org/debian/ wheezy/main Translation-en
500 http://ftp.debian.org/debian/ wheezy/non-free i386 Packages
release v=7.9,o=Debian,a=oldstable,n=wheezy,l=Debian,c=non-free
origin ftp.debian.org
500 http://ftp.debian.org/debian/ wheezy/main i386 Packages
release v=7.9,o=Debian,a=oldstable,n=wheezy,l=Debian,c=main
origin ftp.debian.org
500 http://security.debian.org/ stable/updates/main Translation-en
500 http://security.debian.org/ stable/updates/main i386 Packages
release v=8,o=Debian,a=stable,n=jessie,l=Debian-Security,c=main
origin security.debian.org
500 http://ftp.ie.debian.org/debian/ wheezy/main Translation-en
500 http://ftp.ie.debian.org/debian/ wheezy/main i386 Packages
release v=7.9,o=Debian,a=oldstable,n=wheezy,l=Debian,c=main
origin ftp.ie.debian.org
500 http://mirrors.sunsite.dk/debian/ wheezy/main Translation-en
500 http://mirrors.sunsite.dk/debian/ wheezy/main i386 Packages
release v=7.9,o=Debian,a=oldstable,n=wheezy,l=Debian,c=main
origin mirrors.sunsite.dk
500 http://backports.debian.org/debian-backports/ squeeze-backports/main Translation-en
100 http://backports.debian.org/debian-backports/ squeeze-backports/main i386 Packages
release o=Debian Backports,a=squeeze-backports,n=squeeze-backports,l=Debian Backports,c=main
origin backports.debian.org
500 http://security.debian.org/debian-security/ wheezy/updates/main Translation-en
500 http://security.debian.org/debian-security/ wheezy/updates/main i386 Packages
release v=7.0,o=Debian,a=oldstable,n=wheezy,l=Debian-Security,c=main
origin security.debian.org
500 http://security.debian.org/ testing/updates/main Translation-en
500 http://security.debian.org/ testing/updates/main i386 Packages
release o=Debian,a=testing,n=stretch,l=Debian-Security,c=main
origin security.debian.org
500 http://ftp.dk.debian.org/debian/ wheezy/main Translation-en
500 http://ftp.dk.debian.org/debian/ wheezy/main i386 Packages
release v=7.9,o=Debian,a=oldstable,n=wheezy,l=Debian,c=main
origin ftp.dk.debian.org
Pinned packages: