由於已安裝軟體包的版本號碼有相依性問題，我無法安裝 libav-dbg，這些軟體包與儲存庫中的版本號不對應。這怎麼可能，我該如何解決這個問題？
問題描述：
嘗試安裝 libav-dbg 會產生以下相依性問題：
Reading package lists...
Building dependency tree...
Reading state information...
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:
libav-dbg : Depends: libavcodec55 (= 6:10.2-1) but 10:2.1.3-dmo2 is to be installed or
libavcodec-extra-55 (= 6:10.2-1) but it is not going to be installed
Depends: libavformat55 (= 6:10.2-1) but 10:2.1.3-dmo2 is to be installed
Depends: libswscale2 (= 6:10.2-1) but 10:2.1.3-dmo2 is to be installed
運行apt-cache policy libavcodec55顯示，安裝的版本與儲存庫中的版本不同。
libavcodec55:
Installed: 10:2.1.3-dmo2
Candidate: 10:2.1.3-dmo2
Version table:
*** 10:2.1.3-dmo2 0
100 /var/lib/dpkg/status
6:10.2-2 0
600 http://debian.ethz.ch/debian/ unstable/main amd64 Packages
6:10.2-1 0
650 http://debian.ethz.ch/debian/ testing/main amd64 Packages
在線上 debian 軟體包文件中，我沒有找到任何對版本“10:2.1.3-dmo2”的引用。
有關我的系統的資訊：
我正在使用 apt-pinning 運行 debian 測試來不穩定，但我只對不相關的套件（python3-matplotlib）使用不穩定。我一直在存儲庫中安裝程式。
嘗試解決問題的措施：
apt-get -t testing install libavcodec55
Reading package lists...
Building dependency tree...
Reading state information...
libavcodec55 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded
apt-get --reinstall install libavcodec55
Reading package lists...
Building dependency tree...
Reading state information...
Reinstallation of libavcodec55 is not possible, it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
嘗試刪除 libavcodec55 軟體包以便稍後重新安裝也會刪除大量其他軟體包（一定是由於依賴關係嗎？）。因此，除非有一種方法可以抑制所有其他軟體包的刪除，否則這是不切實際的。
apt-get remove libavcodec55
Reading package lists...
Building dependency tree...
Reading state information...
The following packages were automatically installed and are no longer required:
audacity-data automoc digikam-data dvdauthor dvgrab enblend enfuse freeglut3
genisoimage htdig hugin hugin-data hugin-tools kde-base-artwork
kde-wallpapers-default kde-workspace-data kde-workspace-kgreet-plugins
kdenlive-data kipi-plugins-common liba52-0.7.4-dev libastro-dev libastro1
libboost-filesystem1.54.0 libboost-filesystem1.55.0 libboost-system1.54.0
libcln6 libdc1394-22-dev libdirac-dev libfaac-dev libfaad-dev libfftw3-3
libfftw3-double3 libfftw3-long3 libflac++6 libglew1.10 libgsm1-dev libhdf5-7
libkdcraw-data libkephal4abi1 libkipi-data libksane-data libksane0
libkscreensaver5 libksignalplotter4 libmlt-data libmp3lame-dev
libopencore-amrnb-dev libopencore-amrwb-dev libopencv-core-dev
libopencv-flann-dev libopencv-gpu-dev libopencv-imgproc-dev libopencv-ml-dev
libopencv-photo-dev libopencv-video-dev liborc-0.4-dev libpano13-3
libpano13-bin libphonon-dev libportsmf0 libprocessui4a libpyside1.2
libqalculate5 libqalculate5-data libqextserialport1 libqgpgme1
libqtlocation1 libquazip0 libquicktime2 libraw1394-dev libsbsms10
libschroedinger-dev libshiboken1.2 libshp2 libsoprano-dev libsoundtouch0
libsox-fmt-alsa libsox-fmt-base libsox2 libsoxr0 libswscale-dev
libtheora-dev libvamp-hostsdk3 libvigraimpex4 libwxbase3.0-0 libwxgtk3.0-0
libx264-dev libxvidcore-dev libzthread-2.3-2 marble-data oxygencursors
python-pyside.qtcore python-pyside.qtdeclarative python-pyside.qtgui
python-pyside.qthelp python-pyside.qtnetwork python-pyside.qtopengl
python-pyside.qtscript python-pyside.qtsql python-pyside.qtsvg
python-pyside.qttest python-pyside.qtuitools python-pyside.qtwebkit
python-pyside.qtxml recordmydesktop swh-plugins
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
libavcodec-extra-55 phonon-backend-null
The following packages will be REMOVED:
audacity digikam digikam-private-libs ffmpegthumbs freespacenotifier
frei0r-plugins gimp gstreamer1.0-libav katepart kde-runtime kde-style-oxygen
kde-window-manager kde-workspace kde-workspace-bin kdebase-workspace
kdelibs-bin kdelibs5-dev kdelibs5-plugins kdenlive kdepim-runtime
kdepimlibs-kio-plugins kdepimlibs5-dev kdoctools khelpcenter4 kipi-plugins
klipper kscreen ksysguard libakonadi-calendar4 libakonadi-contact4
libakonadi-kcal4 libakonadi-kde4 libakonadi-kmime4 libakonadi-socialutils4
libakonadi-xml4 libav-tools libavcodec-dev libavcodec55 libavdevice54
libavfilter4 libavformat-dev libavformat55 libchromaprint-tools libcv-dev
libcvaux-dev libgegl-0.2-0 libhighgui-dev libkabc4 libkactivities-bin
libkactivities-models1 libkalarmcal2 libkatepartinterfaces4 libkblog4
libkcal4 libkcalutils4 libkdcraw-dev libkdcraw23 libkde3support4
libkdewebkit5 libkemoticons4 libkexiv2-dev libkfile4 libkgapi2-2 libkhtml5
libkimproxy4 libkio5 libkipi-dev libkipi11 libkmediaplayer4 libknewstuff2-4
libknewstuff3-4 libknotifyconfig4 libkolab0 libkontactinterface4 libkparts4
libkpimidentities4 libkpimtextedit4 libkpimutils4 libkprintutils4
libkrossui4 libksane-dev libktexteditor4 libktnef4 libkutils4
libkworkspace4abi2 libkxmlrpcclient4 libmailtransport4 libmarble-dev
libmarblewidget18 libmicroblog4 libmlt++3 libmlt6 libokularcore4
libopencv-calib3d-dev libopencv-calib3d2.4 libopencv-contrib-dev
libopencv-contrib2.4 libopencv-dev libopencv-features2d-dev
libopencv-features2d2.4 libopencv-gpu2.4 libopencv-highgui-dev
libopencv-highgui2.4 libopencv-legacy-dev libopencv-legacy2.4
libopencv-objdetect-dev libopencv-objdetect2.4 libopencv-ocl-dev
libopencv-ocl2.4 libopencv-stitching-dev libopencv-stitching2.4
libopencv-superres-dev libopencv-superres2.4 libopencv-ts-dev
libopencv-ts2.4 libopencv-videostab-dev libopencv-videostab2.4
libopencv2.4-java libopencv2.4-jni libplasma3 libplasmaclock4abi4
libplasmagenericshell4 libstreamanalyzer0 libsyndication4
libtaskmanager4abi4 libweather-ion6 marble-plugins melt minidlna mplayer2
okular phonon phonon-backend-vlc plasma-dataengines-workspace plasma-desktop
plasma-scriptengine-javascript plasma-widgets-workspace python-pyside
python-pyside.phonon systemsettings vlc vlc-dbg vlc-nox vlc-plugin-notify
vlc-plugin-pulse
The following NEW packages will be installed:
libavcodec-extra-55 phonon-backend-null
0 upgraded, 2 newly installed, 145 to remove and 0 not upgraded.
Need to get 2'855 kB of archives.
After this operation, 310 MB disk space will be freed.
Do you want to continue? [Y/n] Abort.
答案1
*** 10:2.1.3-dmo2 0
100 /var/lib/dpkg/狀態
看起來您是使用dpkg -i libavcodec55*.deb而不是從 apt 儲存庫安裝了 libavcodec55。
從版本號碼中的“-dmo2”來看，我會說它來自http://www.deb-multimedia.org。
您可以嘗試卸載 libavcodec55、libavcodec-extra-55、libavformat55 和 libswscale2：
apt-get remove libavcodec55 libavcodec-extra-55 libavformat55 libswscale2
然後從存儲庫安裝它們：
apt-get install libavcodec55 libavcodec-extra-55 libavformat55 libswscale2
如果您不想刪除依賴這些包的包，您可以使用：
dpkg -r --force-depends libavcodec55 libavcodec-extra-55 libavformat55 libswscale2
您的系統將處於不一致的狀態，但您可以使用 修復該問題apt-get -f install，它會安裝缺少的依賴項，即您剛從儲存庫中刪除的軟體包。
（順便說一句，deb-multimedia 中的 libav* 軟體包來自 ffmpeg 本身，而 Debian 中的那些軟體包則來自利巴夫叉。
您可能有充分的理由想要 deb-multimedia 中的軟體包而不是 Debian 中的軟體包，但在這種情況下，您應該使用 deb-multimedia 的存儲庫而不是手動安裝 DEB。