$ sudo apt --fix-broken install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  ant-contrib apt-config-icons-large bluedevil bluez bluez-obexd breeze-gtk-theme cpp-8 enchant
  golang-docker-credential-helpers gstreamer1.0-alsa gstreamer1.0-pulseaudio gtk2-engines-pixbuf icoutils ieee-data
  kate-data kde-config-sddm kde-runtime-data kde-style-oxygen-qt5 kde-style-qtcurve-qt5 kdelibs5-data kgamma5 khotkeys
  khotkeys-data kinfocenter kmenuedit kscreen kwin-x11 kwrited libasan5 libbasicusageenvironment1
  libboost-chrono1.67.0 libboost-date-time1.67.0 libboost-filesystem1.67.0 libboost-iostreams1.67.0
  libboost-locale1.67.0 libcodec2-0.8.1 libcroco3 libcrystalhd3 libdc1394-22 libdlrestrictions1 libdouble-conversion1
  libebml4v5 libenchant1c2a libf2fs-format4 libf2fs5 libfluidsynth1 libgadu3 libgit2-27 libglu1-mesa libgpgme++2v5
  libgroupsock8 libgssdp-1.0-3 libgupnp-1.0-4 libhttp-parser2.8 libimobiledevice6 libisl19 libkdecorations2private6
  libkf5dbusaddons-bin libkf5iconthemes-bin libkf5people-data libkf5people5 libkf5peoplebackend5 libkf5peoplewidgets5
  libkf5xmlgui-bin libkfontinst5 libkfontinstui5 libkgantt2-l10n libkwineffects11 libkwinglutils11
  libkwinxrenderutils11 liblivemedia64 libmatroska6v5 libmeanwhile1 libmpdec2 libmpx2 libmypaint-1.3-0 libmysofa0
  libnfs12 libntrack0 liborcus-0.14-0 libotr5 liboxygenstyle5-5 liboxygenstyleconfig5-5 libperl5.28 libplacebo7
  libplist3 libprotobuf-lite17 libpython2.7 libpython3.7 libpython3.7-minimal libpython3.7-stdlib libqpdf21
  libqt5concurrent5 libqt5designer5 libqt5help5 libqtcurve-utils2 libre2-5 libscim8v5 libsisu-guice-java
  libsisu-ioc-java libsnmp30 libupower-glib3 libusageenvironment3 libusbmuxd4 libx264-155 libx265-165 libxcb-record0
  linux-headers-4.19.0-17-common linux-kbuild-4.19 ntrack-module-libnl-0 oxygen-icon-theme oxygen-sounds
  phonon-backend-gstreamer-common plasma-desktop plasma-desktop-data plasma-discover plasma-discover-common
  printer-driver-hpijs python3-asn1crypto python3-distro-info python3-dockerpycreds python3-future python3-pyqt5

  katepart kde-l10n-engb kde-runtime kde-style-qtcurve-qt4 kdelibs-bin kdelibs5-plugins kdoctools kopete libattica0.4
  libdbusmenu-qt2 libkabc4 libkactivities6 libkatepartinterfaces4 libkcmutils4 libkde3support4 libkdeclarative5
  libkdecore5 libkdesu5 libkdeui5 libkdewebkit5 libkdnssd4 libkemoticons4 libkfile4 libkhtml5 libkio5 libkjsapi4
  libkjsembed4 libkldap4 libkmediaplayer4 libkmime4 libknewstuff2-4 libknewstuff3-4 libknotifyconfig4 libkntlm4
  libkopete4 libkparts4 libkpimidentities4 libkpimtextedit4 libkpimutils4 libkpty4 libkresources4 libkrosscore4
  libktexteditor4 libntrack-qt4-1 libphonon4 libplasma3 libpolkit-qt-1-1 libqca2 libqca2-plugins libqimageblitz4
  libqjson0 libqt4-dbus libqt4-declarative libqt4-designer libqt4-network libqt4-opengl libqt4-qt3support
  libqt4-script libqt4-sql libqt4-sql-mysql libqt4-sql-sqlite libqt4-svg libqt4-xml libqt4-xmlpatterns libqtdbus4
  libqtgui4 libqtwebkit4 libsolid4 libthreadweaver4 phonon phonon-backend-gstreamer plasma-scriptengine-javascript
  qdbus qt-at-spi
The following NEW packages will be installed:
  python-is-python2
The following packages will be upgraded:
  libpam-modules
1 upgraded, 1 newly installed, 74 to remove and 420 not upgraded.
631 not fully installed or removed.
Need to get 0 B/329 kB of archives.
After this operation, 176 MB disk space will be freed.
Do you want to continue? [Y/n] y
Reading changelogs... Done
Preconfiguring packages ...
(Reading database ... 190384 files and directories currently installed.)
Preparing to unpack .../libpam-modules_1.4.0-9_amd64.deb ...
dpkg: error processing archive /var/cache/apt/archives/libpam-modules_1.4.0-9_amd64.deb (--unpack):
 new libpam-modules:amd64 package pre-installation script subprocess returned error exit status 2
Errors were encountered while processing:
 /var/cache/apt/archives/libpam-modules_1.4.0-9_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)