I downloaded the .deb file from the Steam website, but couldn't install it as it complained about having and outdated version of libc6. I look around and apparently I have to add jessie sources to my sources.list to make it work, and so I do. The package installs but itself is a front to install steam's dependencies. I run it, and instead of simply installing the three dependencies described (libgl1-mesa-dri:i386, libgl1-mesa-glx:i386 and libc6:i386), it instead wants to do all this:The following packages were automatically installed and are no longer required:  blt cups-daemon cups-server-common dconf-cli empathy-common geoclue-2.0 gir1.2-gck-1 gir1.2-gst-plugins-base-1.0 gir1.2-gstreamer-1.0  gir1.2-ibus-1.0 gir1.2-javascriptcoregtk-3.0 gir1.2-notify-0.7 gnome-panel-data gnome-session-common gnome-themes-standard-data gstreamer1.0-nice  gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-pulseaudio hp-ppd libarchive13 libasound2-dev libassuan0 libavahi-client-dev  libavahi-common-dev libavcodec55 libavformat55 libbz2-1.0:i386 libcaca-dev libcamel-1.2-49 libcaribou-common libchromaprint0 libdb5.3:i386  libdbus-1-dev libdirectfb-dev libdirectfb-extra libdrm-dev libdrm-nouveau1a libebackend-1.2-7 libebook-1.2-14 libebook-contacts-1.2-0  libecal-1.2-16 libedata-book-1.2-20 libedata-cal-1.2-23 libedataserver-1.2-18 libfluidsynth1 libfontembed1 libfreetype6-dev libgadu3  libgcr-base-3-1 libgd3 libgexiv2-2 libgl1-mesa-dev libglu1-mesa-dev libgphoto2-6 libgphoto2-port10 libgrilo-0.2-1 libgstreamer-plugins-bad1.0-0  libgstreamer-plugins-base1.0-0 libgstreamer1.0-0 libibus-1.0-5 libical1 libinput0 libjpeg8-dev libjson0 liblzma5:i386 libmjpegutils-2.1-0  libmozjs-24-0 libmpdec2 libmpdec2:i386 libmpeg2encpp-2.1-0 libmpg123-0 libmplex2-2.1-0 libmx-common libncursesw5:i386 libnm-gtk-common  libopencv-core2.4 libopencv-flann2.4 libopencv-imgproc2.4 libopencv-ml2.4 libopencv-video2.4 libpackagekit-glib2-16 libpcre3-dev libpcrecpp0  libpng12-dev libpthread-stubs0 libpthread-stubs0-dev libpython3-stdlib libpython3-stdlib:i386 libpython3.4-minimal libpython3.4-minimal:i386  libpython3.4-stdlib libpython3.4-stdlib:i386 libqpdf13 libreadline6:i386 librtmp1 libsbc1 libslang2-dev libsqlite3-0:i386 libsrtp0  libssl1.0.0:i386 libtbb2 libtotem-plparser18 libtracker-sparql-1.0-0 libts-dev libwayland-cursor0 libwebp5 libx11-dev libx11-doc libx11-xcb-dev  libx264-142 libxau-dev libxcb-dri2-0-dev libxcb-dri3-dev libxcb-glx0-dev libxcb-present-dev libxcb-randr0 libxcb-randr0-dev libxcb-render0-dev  libxcb-shape0-dev libxcb-sync-dev libxcb-xfixes0-dev libxcb1-dev libxdamage-dev libxdmcp-dev libxext-dev libxfixes-dev libxkbcommon0  libxshmfence-dev libxxf86vm-dev mesa-common-dev pkg-config python-aptdaemon python-defer python-pkg-resources python3.4:i386  python3.4-minimal:i386 x11proto-core-dev x11proto-damage-dev x11proto-dri2-dev x11proto-fixes-dev x11proto-gl-dev x11proto-input-dev  x11proto-kb-dev x11proto-xext-dev x11proto-xf86vidmode-dev xorg-sgml-doctools xtrans-dev zlib1g-devUse 'apt-get autoremove' to remove them.The following extra packages will be installed:  bzip2 colord colord-data cups-bsd cups-client cups-common cups-daemon cups-ppdc cups-server-common cupsddk dbus-x11 dconf-cli  dconf-gsettings-backend dconf-service empathy-common evince-common evolution-data-server-common folks-common fontconfig-config gcc-4.9-base  gcc-4.9-base:i386 geoclue-2.0 gir1.2-atspi-2.0 gir1.2-freedesktop gir1.2-gck-1 gir1.2-gdesktopenums-3.0 gir1.2-glib-2.0  gir1.2-gst-plugins-base-1.0 gir1.2-gstreamer-1.0 gir1.2-ibus-1.0 gir1.2-javascriptcoregtk-3.0 gir1.2-notify-0.7 gir1.2-soup-2.4  gir1.2-telepathylogger-0.2 gir1.2-upowerglib-1.0 glib-networking glib-networking-common glib-networking-services gnome-desktop3-data  gnome-packagekit-data gnome-panel-data gnome-session-common gnome-shell-common gnome-themes-standard-data gsettings-desktop-schemas  gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-pulseaudio gvfs gvfs-bin gvfs-common gvfs-daemons gvfs-libs init-system-helpers  libarchive13 libassuan0 libatk1.0-0 libatk1.0-data libatspi2.0-0 libaudit-common libaudit1 libavcodec55 libavformat55 libavutil53 libburn4  libbz2-1.0 libc6:i386 libc6-i686:i386 libcairo-perl libcairo2 libcamel-1.2-49 libcaribou-common libcolord2 libcolorhug2 libcups2 libcupscgi1  libcupsfilters1 libcupsimage2 libcupsmime1 libcupsppdc1 libdb5.3 libdbus-glib-1-2 libdconf1 libdjvulibre-text libdjvulibre21 libdrm-dev  libdrm-intel1 libdrm-intel1:i386 libdrm-nouveau2 libdrm-nouveau2:i386 libdrm-radeon1 libdrm-radeon1:i386 libdrm2 libdrm2:i386 libebackend-1.2-7  libebook-1.2-14 libebook-contacts-1.2-0 libecal-1.2-16 libedata-book-1.2-20 libedata-cal-1.2-23 libedataserver-1.2-18 libegl1-mesa  libegl1-mesa-drivers libelf1 libelf1:i386 libelfg0 libepoxy0 libevdev2 libexpat1 libexpat1:i386 libffi6 libffi6:i386 libfftw3-3 libfftw3-double3  libfftw3-long3 libfftw3-single3 libflac8 libfolks-telepathy25 libfolks25 libfontconfig1 libfontembed1 libgbm1 libgcc1 libgcc1:i386 libgck-1-0  libgcr-base-3-1 libgcrypt11 libgcrypt20 libgd3 libgdk-pixbuf2.0-0 libgdk-pixbuf2.0-common libgee-0.8-2 libgeocode-glib0 libgexiv2-2  libgirepository-1.0-1 libgl1-mesa-dev libgl1-mesa-dri libgl1-mesa-glx libglapi-mesa libglib-perl libglib2.0-0 libglib2.0-bin libglibmm-2.4-1c2a  libgmp10 libgnomekbd-common libgnutls-deb0-28 libgomp1 libgphoto2-6 libgphoto2-port10 libgrilo-0.2-1 libgstreamer-plugins-base1.0-0  libgstreamer1.0-0 libgtk-3-common libgutenprint2 libgweather-common libhogweed2 libhtml-parser-perl libibus-1.0-5 libical1 libicu52  libimobiledevice4 libinput0 libjavascriptcoregtk-3.0-0 libjson-c2 liblcms2-2 libllvm3.4 libllvm3.4:i386 liblocale-gettext-perl libmagickcore5  libmm-glib0 libmozjs-24-0 libmpdec2 libmx-common libncurses5 libncursesw5 libndp0 libnet-dbus-perl libnet-ssleay-perl libnettle4 libnl-3-200  libnl-genl-3-200 libnl-route-3-200 libnm-glib4 libnm-gtk-common libnm-util2 libopenjpeg5 libopenvg1-mesa libopus0 liborc-0.4-0 libp11-kit0  libpackagekit-glib2-16 libpam-systemd libparted2 libpciaccess0 libpciaccess0:i386 libpcre3 libpcre3-dev libpcrecpp0 libperl4-corelibs-perl  libperl5.18 libpixman-1-0 libplist2 libpoppler-glib8 libpoppler46 libproxy1 libpulse-mainloop-glib0 libpulse0 libpulsedsp libpurple0  libpython3-stdlib libpython3.4-minimal libpython3.4-stdlib libqpdf13 libreadline6 librtmp1 libsdl1.2debian libsecret-1-0 libsecret-common  libsocket-perl libsoundtouch0 libsoup2.4-1 libsqlite3-0 libssl1.0.0 libstdc++6 libstdc++6:i386 libswscale2 libsystemd-daemon0 libsystemd-id128-0  libsystemd-journal0 libsystemd-login0 libtasn1-6 libtelepathy-glib0 libtelepathy-logger3 libtext-charwidth-perl libtext-iconv-perl libtiff5  libtinfo5 libtinfo5:i386 libtotem-plparser18 libtracker-sparql-1.0-0 libtxc-dxtn-s2tc0 libtxc-dxtn-s2tc0:i386 libudev1 libudisks2-0  libupower-glib2 libusbmuxd2 libuuid-perl libva1 libvpx1 libwacom-common libwacom2 libwayland-client0 libwayland-cursor0 libwayland-egl1-mesa  libwayland-server0 libwebp5 libx11-6 libx11-dev libx11-xcb-dev libx11-xcb1 libx264-142 libxatracker2 libxcb-dri2-0 libxcb-dri2-0-dev libxcb-dri3-0  libxcb-dri3-dev libxcb-glx0 libxcb-glx0-dev libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-present-dev libxcb-present0 libxcb-randr0  libxcb-randr0-dev libxcb-render0 libxcb-render0-dev libxcb-shape0 libxcb-shape0-dev libxcb-sync-dev libxcb-sync1 libxcb-xf86dri0 libxcb-xfixes0  libxcb-xfixes0-dev libxcb-xv0 libxcb1 libxcb1-dev libxdamage-dev libxdamage1 libxfixes-dev libxfixes3 libxi6 libxkbcommon0 libxml-parser-perl  libxml2 libxshmfence-dev libxshmfence1 libxxf86vm-dev libxxf86vm1 libzeitgeist-2.0-0 mesa-common-dev mime-support nautilus-data network-manager  parted perl perl-base perl-modules perlmagick policykit-1 ppp printer-driver-c2esp pulseaudio pulseaudio-module-x11 pulseaudio-utils  python-aptdaemon python-gi python-gi-cairo systemd systemd-sysv udisks2 upower usbmuxd x11proto-damage-dev x11proto-dri2-dev x11proto-fixes-dev  x11proto-gl-dev x11proto-xf86vidmode-dev xserver-common xserver-xephyr xserver-xorg-core xserver-xorg-input-evdev xserver-xorg-input-mouse  xserver-xorg-input-synaptics xserver-xorg-input-vmmouse xserver-xorg-input-wacom xserver-xorg-video-all xserver-xorg-video-ati  xserver-xorg-video-cirrus xserver-xorg-video-fbdev xserver-xorg-video-intel xserver-xorg-video-mach64 xserver-xorg-video-mga  xserver-xorg-video-modesetting xserver-xorg-video-neomagic xserver-xorg-video-nouveau xserver-xorg-video-openchrome xserver-xorg-video-r128  xserver-xorg-video-radeon xserver-xorg-video-savage xserver-xorg-video-siliconmotion xserver-xorg-video-sisusb xserver-xorg-video-tdfx  xserver-xorg-video-trident xserver-xorg-video-vesa xserver-xorg-video-vmware zlib1g zlib1g:i386 zlib1g-devSuggested packages:  bzip2-doc xpp cups-pdf lrzip glibc-doc:i386 locales:i386 libfont-freetype-perl libfftw3-bin libfftw3-dev rng-tools libgd-tools libglide3  libglide3:i386 gnutls-bin gphoto2 gtkam grilo-plugins-0.2 gstreamer-codec-install gnome-codec-install gstreamer1.0-tools gutenprint-locales  libdata-dump-perl libusbmuxd-tools liblcms2-utils opus-tools libparted-dev libparted-i18n libxcb-doc parted-doc perl-doc libterm-readline-gnu-perl  libterm-readline-perl-perl make libb-lint-perl libcpanplus-dist-build-perl libcpanplus-perl libfile-checktree-perl liblog-message-simple-perl  liblog-message-perl libobject-accessor-perl imagemagick-doc pavumeter pavucontrol paman paprefs systemd-ui xfsprogs reiserfsprogs exfat-utils  btrfs-tools mdadm gpointing-device-settings touchfreeze xinput firmware-linuxRecommended packages:  cups-browsed gstreamer1.0-x qpdf va-driver-all va-driver rename libarchive-extract-perl libmodule-pluggable-perl libpod-latex-perl libterm-ui-perl  libtext-soundex-perl gdisk xserver-xorg-video-qxlThe following packages will be REMOVED:  aisleriot alacarte aptdaemon baobab bluez-cups brasero caribou caribou-antler cheese cups dconf-tools empathy eog evince evolution  evolution-data-server evolution-plugins evolution-webcal file-roller gcalctool gcr gdebi gdm3 gedit gedit-plugins gir1.2-caribou-1.0  gir1.2-clutter-1.0 gir1.2-clutter-gst-1.0 gir1.2-evince-3.0 gir1.2-gcr-3 gir1.2-gkbd-3.0 gir1.2-gnomebluetooth-1.0 gir1.2-goa-1.0 gir1.2-gtk-3.0  gir1.2-gtkclutter-1.0 gir1.2-gtksource-3.0 gir1.2-gucharmap-2.90 gir1.2-mutter-3.0 gir1.2-panelapplet-4.0 gir1.2-peas-1.0 gir1.2-rb-3.0  gir1.2-totem-1.0 gir1.2-vte-2.90 gir1.2-webkit-3.0 gir1.2-wnck-3.0 gkbd-capplet glchess glines gnect gnibbles gnobots2 gnome gnome-applets  gnome-bluetooth gnome-color-manager gnome-contacts gnome-control-center gnome-core gnome-dictionary gnome-disk-utility gnome-documents  gnome-font-viewer gnome-games gnome-icon-theme gnome-icon-theme-extras gnome-icon-theme-symbolic gnome-keyring gnome-media gnome-nettool  gnome-online-accounts gnome-orca gnome-packagekit gnome-panel gnome-power-manager gnome-screensaver gnome-screenshot gnome-session  gnome-session-bin gnome-session-fallback gnome-settings-daemon gnome-shell gnome-shell-extensions gnome-sudoku gnome-sushi gnome-system-log  gnome-system-monitor gnome-terminal gnome-themes-standard gnome-tweak-tool gnome-user-guide gnome-user-share gnomine gnotravex gnotski gtali  gucharmap gvfs-backends hpijs hplip iagno idle-python3.2 idle3 libaudit0 libavahi-ui-gtk3-0 libbrasero-media3-1 libcanberra-gtk3-0  libcanberra-gtk3-module libcaribou-gtk3-module libcaribou0 libchamplain-0.12-0 libchamplain-gtk-0.12-0 libcheese-gtk21 libcheese3 libclutter-1.0-0  libclutter-gst-1.0-0 libclutter-gtk-1.0-0 libclutter-imcontext-0.1-0 libclutter-imcontext-0.1-bin libcluttergesture-0.0.2-0 libcupsdriver1  libedata-book-1.2-13 libedataserverui-3.0-1 libepc-ui-1.0-3 libevdocument3-4 libevolution libevview3-3 libfolks-eds25 libgail-3-0 libgcr-3-1  libgdict-1.0-6 libgdu-gtk0 libglib2.0-dev libgnome-bluetooth10 libgnome-desktop-3-2 libgnome-media-profiles-3.0-0 libgnomekbd7 libgoa-1.0-0  libgtk-3-0 libgtk-3-bin libgtk-vnc-2.0-0 libgtk2-perl libgtkhtml-4.0-0 libgtkhtml-4.0-common libgtkhtml-editor-4.0-0 libgtkmm-3.0-1  libgtksourceview-3.0-0 libgucharmap-2-90-7 libgweather-3-0 libhpmud0 libmutter0 libmx-1.0-2 libnautilus-extension1a libnm-gtk0 libpanel-applet-4-0  libpango-perl libpeas-1.0-0 libperl5.14 libpulse-dev librhythmbox-core6 libsane-hpaio libsdl1.2-dev libseed-gtk3-0 libsnmp15 libtotem0  libunique-3.0-0 libvte-2.90-9 libwebkitgtk-3.0-0 libwnck-3-0 libyelp0 lightsoff mahjongg metacity mousetweaks nautilus nautilus-sendto  nautilus-sendto-empathy network-manager-gnome notification-daemon policykit-1-gnome printer-driver-gutenprint printer-driver-hpcups  printer-driver-hpijs printer-driver-postscript-hp printer-driver-splix python-aptdaemon.gtk3widgets python3 python3-tk quadrapassel rhythmbox  rhythmbox-plugin-cdrecorder rhythmbox-plugins rygel-preferences seahorse shotwell simple-scan software-properties-gtk sound-juicer steam-launcher  swell-foop task-gnome-desktop task-print-server totem totem-plugins tracker-gui transmission-gtk vinagre vino xdg-user-dirs-gtk  xserver-xorg-video-apm xserver-xorg-video-ark xserver-xorg-video-chips xserver-xorg-video-i128 xserver-xorg-video-rendition xserver-xorg-video-s3  xserver-xorg-video-s3virge xserver-xorg-video-sis xserver-xorg-video-tseng xserver-xorg-video-voodoo yelp zenityThe following NEW packages will be installed:  colord-data cups-daemon cups-server-common cupsddk dconf-cli gcc-4.9-base gcc-4.9-base:i386 geoclue-2.0 gir1.2-gst-plugins-base-1.0  gir1.2-gstreamer-1.0 gir1.2-ibus-1.0 gir1.2-notify-0.7 gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-pulseaudio  init-system-helpers libarchive13 libassuan0 libaudit-common libaudit1 libavcodec55 libavformat55 libavutil53 libc6:i386 libc6-i686:i386  libcamel-1.2-49 libcolord2 libcolorhug2 libdb5.3 libdconf1 libdrm-dev libdrm-intel1:i386 libdrm-nouveau2 libdrm-nouveau2:i386 libdrm-radeon1:i386  libdrm2:i386 libebackend-1.2-7 libebook-1.2-14 libebook-contacts-1.2-0 libecal-1.2-16 libedata-book-1.2-20 libedata-cal-1.2-23  libedataserver-1.2-18 libegl1-mesa libegl1-mesa-drivers libelf1:i386 libelfg0 libepoxy0 libevdev2 libexpat1:i386 libffi6 libffi6:i386  libfftw3-double3 libfftw3-long3 libfftw3-single3 libfontembed1 libgbm1 libgcc1:i386 libgcr-base-3-1 libgcrypt20 libgd3 libgee-0.8-2 libgexiv2-2  libgl1-mesa-dri:i386 libgnutls-deb0-28 libgphoto2-6 libgphoto2-port10 libgrilo-0.2-1 libgstreamer-plugins-base1.0-0 libgstreamer1.0-0 libhogweed2  libibus-1.0-5 libical1 libicu52 libimobiledevice4 libinput0 libjson-c2 libllvm3.4 libllvm3.4:i386 libmm-glib0 libmozjs-24-0 libmpdec2 libndp0  libopenjpeg5 libopenvg1-mesa libpackagekit-glib2-16 libpam-systemd libparted2 libpciaccess0:i386 libperl4-corelibs-perl libperl5.18 libplist2  libpoppler46 libproxy1 libpulsedsp libpython3-stdlib libpython3.4-minimal libpython3.4-stdlib libqpdf13 librtmp1 libsecret-1-0 libsecret-common  libstdc++6:i386 libsystemd-id128-0 libsystemd-journal0 libtasn1-6 libtelepathy-logger3 libtiff5 libtinfo5:i386 libtotem-plparser18  libtracker-sparql-1.0-0 libtxc-dxtn-s2tc0 libtxc-dxtn-s2tc0:i386 libudev1 libudisks2-0 libupower-glib2 libusbmuxd2 libwayland-client0  libwayland-cursor0 libwayland-egl1-mesa libwayland-server0 libwebp5 libx11-xcb-dev libx264-142 libxatracker2 libxcb-dri2-0-dev libxcb-dri3-0  libxcb-dri3-dev libxcb-glx0-dev libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-present-dev libxcb-present0 libxcb-randr0 libxcb-randr0-dev  libxcb-render0-dev libxcb-shape0-dev libxcb-sync-dev libxcb-sync1 libxcb-xf86dri0 libxcb-xfixes0 libxcb-xfixes0-dev libxcb-xv0 libxdamage-dev  libxfixes-dev libxkbcommon0 libxshmfence-dev libxshmfence1 libxxf86vm-dev libzeitgeist-2.0-0 parted systemd systemd-sysv udisks2  x11proto-damage-dev x11proto-dri2-dev x11proto-fixes-dev x11proto-gl-dev x11proto-xf86vidmode-dev xserver-xorg-video-modesetting zlib1g:i386The following packages will be upgraded:  bzip2 colord cups-bsd cups-client cups-common cups-ppdc dbus-x11 dconf-gsettings-backend dconf-service empathy-common evince-common  evolution-data-server-common folks-common fontconfig-config gir1.2-atspi-2.0 gir1.2-freedesktop gir1.2-gck-1 gir1.2-gdesktopenums-3.0  gir1.2-glib-2.0 gir1.2-javascriptcoregtk-3.0 gir1.2-soup-2.4 gir1.2-telepathylogger-0.2 gir1.2-upowerglib-1.0 glib-networking  glib-networking-common glib-networking-services gnome-desktop3-data gnome-packagekit-data gnome-panel-data gnome-session-common gnome-shell-common  gnome-themes-standard-data gsettings-desktop-schemas gvfs gvfs-bin gvfs-common gvfs-daemons gvfs-libs libatk1.0-0 libatk1.0-data libatspi2.0-0  libburn4 libbz2-1.0 libcairo-perl libcairo2 libcaribou-common libcups2 libcupscgi1 libcupsfilters1 libcupsimage2 libcupsmime1 libcupsppdc1  libdbus-glib-1-2 libdjvulibre-text libdjvulibre21 libdrm-intel1 libdrm-radeon1 libdrm2 libelf1 libexpat1 libfftw3-3 libflac8 libfolks-telepathy25  libfolks25 libfontconfig1 libgcc1 libgck-1-0 libgcrypt11 libgdk-pixbuf2.0-0 libgdk-pixbuf2.0-common libgeocode-glib0 libgirepository-1.0-1  libgl1-mesa-dev libgl1-mesa-dri libgl1-mesa-glx libglapi-mesa libglib-perl libglib2.0-0 libglib2.0-bin libglibmm-2.4-1c2a libgmp10  libgnomekbd-common libgomp1 libgtk-3-common libgutenprint2 libgweather-common libhtml-parser-perl libjavascriptcoregtk-3.0-0 liblcms2-2  liblocale-gettext-perl libmagickcore5 libmx-common libncurses5 libncursesw5 libnet-dbus-perl libnet-ssleay-perl libnettle4 libnl-3-200  libnl-genl-3-200 libnl-route-3-200 libnm-glib4 libnm-gtk-common libnm-util2 libopus0 liborc-0.4-0 libp11-kit0 libpciaccess0 libpcre3 libpcre3-dev  libpcrecpp0 libpixman-1-0 libpoppler-glib8 libpulse-mainloop-glib0 libpulse0 libpurple0 libreadline6 libsdl1.2debian libsocket-perl libsoundtouch0  libsoup2.4-1 libsqlite3-0 libssl1.0.0 libstdc++6 libswscale2 libsystemd-daemon0 libsystemd-login0 libtelepathy-glib0 libtext-charwidth-perl  libtext-iconv-perl libtinfo5 libuuid-perl libva1 libvpx1 libwacom-common libwacom2 libx11-6 libx11-dev libx11-xcb1 libxcb-dri2-0 libxcb-glx0  libxcb-render0 libxcb-shape0 libxcb1 libxcb1-dev libxdamage1 libxfixes3 libxi6 libxml-parser-perl libxml2 libxxf86vm1 mesa-common-dev mime-support  nautilus-data network-manager perl perl-base perl-modules perlmagick policykit-1 ppp printer-driver-c2esp pulseaudio pulseaudio-module-x11  pulseaudio-utils python-aptdaemon python-gi python-gi-cairo upower usbmuxd xserver-common xserver-xephyr xserver-xorg-core  xserver-xorg-input-evdev xserver-xorg-input-mouse xserver-xorg-input-synaptics xserver-xorg-input-vmmouse xserver-xorg-input-wacom  xserver-xorg-video-all xserver-xorg-video-ati xserver-xorg-video-cirrus xserver-xorg-video-fbdev xserver-xorg-video-intel  xserver-xorg-video-mach64 xserver-xorg-video-mga xserver-xorg-video-neomagic xserver-xorg-video-nouveau xserver-xorg-video-openchrome  xserver-xorg-video-r128 xserver-xorg-video-radeon xserver-xorg-video-savage xserver-xorg-video-siliconmotion xserver-xorg-video-sisusb  xserver-xorg-video-tdfx xserver-xorg-video-trident xserver-xorg-video-vesa xserver-xorg-video-vmware zlib1g zlib1g-dev198 upgraded, 162 newly installed, 220 to remove and 916 not upgraded.Need to get 163 MB of archives.After this operation, 167 MB disk space will be freed.I assume this is it wanting to upgrade to all the new Jessie stuff. I take it just letting this run will break my system? Is there any way to just install what Steam needs, or to go about installing steam some other way? (I got it working before somehow, and this is basically a fresh debian install).
Installing Steam on Debian Wheezy
debian;terminal;apt;steam
You can use gdebi to install the Debian Steam installer made by Ghost Squad 57, available from Github. It gets around the issues raised by Valve's installer and has not encountered any issues on Wheezy.