dist-upgrade до squeeze хочет удалить apt

почему dist-upgrade до squeeze хочет удалить apt и как это исправить?

$ sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages will be REMOVED:
  apt apt-file apt-utils aptitude binutils build-essential debhelper dpkg-dev dselect elinks g++ g++-3.3 g++-4.0 g++-4.1 g++-4.3 gcc
  gcc-3.3 gcc-4.0 gcc-4.1 gcc-4.3 gettext gettext-base groff-base html2text iceweasel imagemagick intltool-debian iperf kernel-package
  libapt-pkg-perl libboost-iostreams1.42.0 libcwidget3 libdatrie0 libdjvulibre21 libept1 libfreebob0 libgc1c2 libglu1-mesa libgomp1
  libgraphviz4 libhunspell-1.2-0 libilmbase6 libmagick10 libopenexr6 libossp-uuid-perl libossp-uuid15 libreadline5 libruby1.8
  libsigc++-1.2-5c2 libsigc++-2.0-0c2a libsoap-lite-perl libstdc++5 libstdc++5-3.3-dev libstdc++6 libstdc++6-4.0-dev libstdc++6-4.1-dev
  libstdc++6-4.3-dev libtorrent10 libvdemgmt0 libwine-gl libxapian15 libxapian22 libxcb-xlib0 libxmlrpc-c3 lzma man-db menu
  mysql-client-5.0 mysql-server-5.0 nessusclient nmap po-debconf pppoeconf python-glade2 python-gtk2 python-numeric python2.3 python2.4
  reportbug rtorrent tasksel tasksel-data tcptrack telnet unrar-nonfree utf8-migration-tool w3m wine xserver-xorg-video-cyrix
  xserver-xorg-video-imstt xserver-xorg-video-nsc xserver-xorg-video-v4l xserver-xorg-video-vga xulrunner-1.9
The following NEW packages will be installed:
  apache2.2-bin autopoint dbus dbus-x11 esound-common etherboot-qemu gdbserver git gnupg-curl insserv install-info isc-dhcp-client
  isc-dhcp-common keyboard-configuration libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl libaprutil1-dbd-sqlite3
  libaprutil1-ldap libasyncns0 libaudiofile0 libaudit0 libbind9-60 libbluetooth3 libbsd0 libc-ares2 libc-bin libc-dev-bin libcap2-bin
  libcdt4 libclass-inspector-perl libcupsimage2 libcurl3-gnutls libdatrie1 libdbus-glib-1-2 libdirectfb-1.2-9 libdjvulibre-text libdns69
  libdpkg-perl libdrm-intel1 libdrm-nouveau1 libdrm-radeon1 liberror-perl libesd0 libfile-copy-recursive-perl libflac8 libgcr0 libgp11-0
  libgpgme11 libgraph4 libgssapi-krb5-2 libgvc5 libisc62 libisccc60 libisccfg62 libjbig2dec0 libjpeg8 libk5crypto3 libkrb5-3
  libkrb5support0 liblqr-1-0 libltdl7 liblwres60 liblzma2 libmpfr4 libmysqlclient16 libnfnetlink0 libogg0 libonig2 libopts25 libpathplan4
  libpciaccess0 libpth20 libpulse0 libpython2.6 libqdbm14 libraw1394-11 libreadline6 libsasl2-modules libsmi2ldbl libsndfile1
  libtask-weaken-perl libtest-pod-perl libtokyocabinet8 libtre5 libudev0 libunistring0 libutempter0 libv4l-0 libvde0 libvorbis0a
  libvorbisenc2 libx11-protocol-perl libx11-xcb1 libxcb-atom1 libxcb-aux0 libxcb-dri2-0 libxcb-event1 libxdot4 libxvmc1
  linux-image-2.6.32-5-686 lockfile-progs lynx lynx-cur multiboot openbios-ppc os-prober perl-tk php5-suhosin python2.6 python2.6-minimal
  qemu-keymaps qemu-system qemu-user qemu-utils seabios sensible-utils shared-mime-info tsconf xserver-common xserver-xorg-video-geode
  xserver-xorg-video-nouveau xz-utils
The following packages have been kept back:
  cpp cpp-4.3 gcc-4.3-base grub grub-common libgcc1
The following packages will be upgraded:
  apache2 apache2-mpm-prefork apache2.2-common bash bash-doc bc bind9 bind9-host bind9utils cpio cpp-4.1 cron dash dc debianutils
  dhcp3-client dhcp3-common djvulibre-desktop dnsutils dpkg e2fsprogs ed elinks-data fdutils findutils flex ftp fvwm gcc-4.1-base gconf2
  gconf2-common gdb gksu gnome-keyring gnupg gpgv grep grub-doc grub-legacy-doc info iptables ispell libapache2-mod-auth-plain
  libapache2-mod-php5 libaprutil1 libavc1394-0 libc6 libc6-dev libc6-i686 libcairo2 libcups2 libcurl3 libdbd-mysql-perl libedit2
  libgconf2-4 libgdbm3 libgksu2-0 libgl1-mesa-dri libgl1-mesa-glx libglade2-0 libglib2.0-0 libgnome-keyring0 libgphoto2-2
  libgphoto2-port0 libgsf-1-114 libgtk2.0-0 libgtop2-7 libiec61883-0 libjpeg-progs libkrb53 libmail-box-perl libnss-db liborbit2
  libpango1.0-0 libpq5 librsvg2-2 libsane libsdl1.2debian libsdl1.2debian-alsa libstartup-notification0 libthai-data libthai0 libts-0.0-0
  libwine libwine-alsa libwine-cms libwine-gphoto2 libwine-ldap libwine-print libwine-sane libx11-6 libxcb1 libxi6 libxml2-utils
  linux-image-2.6-686 linux-image-686 locales m4 mtools multiboot-doc mutt ntp ntpdate openbios-sparc openssh-client openssh-server php5
  php5-cli php5-common php5-gd php5-mysql python python-cairo python-gobject python-minimal python2.5 python2.5-minimal qemu
  readline-common recode screen sed sharutils sudo sysv-rc tshark udev update-inetd util-linux vde2 wget wine-bin wine-utils wireshark
  wireshark-common x11-utils xserver-xorg xserver-xorg-core xserver-xorg-input-evdev xserver-xorg-input-kbd xserver-xorg-input-mouse
  xserver-xorg-input-synaptics xserver-xorg-input-wacom xserver-xorg-video-all xserver-xorg-video-apm xserver-xorg-video-ark
  xserver-xorg-video-ati xserver-xorg-video-chips xserver-xorg-video-cirrus xserver-xorg-video-dummy xserver-xorg-video-fbdev
  xserver-xorg-video-glint xserver-xorg-video-i128 xserver-xorg-video-i740 xserver-xorg-video-intel xserver-xorg-video-mach64
  xserver-xorg-video-mga xserver-xorg-video-neomagic xserver-xorg-video-nv xserver-xorg-video-openchrome xserver-xorg-video-r128
  xserver-xorg-video-radeon xserver-xorg-video-radeonhd xserver-xorg-video-rendition xserver-xorg-video-s3 xserver-xorg-video-s3virge
  xserver-xorg-video-savage xserver-xorg-video-siliconmotion xserver-xorg-video-sis xserver-xorg-video-sisusb xserver-xorg-video-tdfx
  xserver-xorg-video-tga xserver-xorg-video-trident xserver-xorg-video-tseng xserver-xorg-video-vesa xserver-xorg-video-vmware
  xserver-xorg-video-voodoo xterm
WARNING: The following essential packages will be removed.
This should NOT be done unless you know exactly what you are doing!
  apt libstdc++6 (due to apt) lzma (due to dpkg)
178 upgraded, 123 newly installed, 94 to remove and 6 not upgraded.
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After this operation, 123 MB disk space will be freed.
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