~$ dpkg-query -W -f='${Priority} \t${Package} \n' | egrep -i 'standard|important|required' | sort
important       adduser
important       apt
important       aptitude
important       apt-utils
important       bsdmainutils
important       cpio
important       cron
important       debconf
important       debconf-i18n
important       debian-archive-keyring
important       dhcp-client
important       dmidecode
important       ed
important       gnupg
important       gpgv
important       groff-base
important       ifupdown
important       info
important       iptables
important       iputils-ping
important       klogd
important       laptop-detect
important       libbz2-1.0
important       libcwidget3
important       libgcrypt11
important       libgdbm3
important       libgnutls11
important       libgnutls13
important       libgnutls26
important       libgpg-error0
important       libldap2
important       libldap-2.2-7
important       liblzo1
important       liblzo2-2
important       libncursesw5
important       libnewt0.52
important       libopencdk10
important       libopencdk8
important       libpcre3
important       libpopt0
important       libreadline5
important       libsasl2
important       libsasl2-2
important       libssl0.9.8
important       libsysfs2
important       libtasn1-0
important       libtasn1-2
important       libtasn1-3
important       libusb-0.1-4
important       libvolume-id0
important       libwrap0
important       logrotate
important       man-db
important       manpages
important       module-init-tools
important       modutils
important       nano
important       netbase
important       netcat
important       net-tools
important       nvi
important       sysklogd
important       tasksel
important       tasksel-data
important       tcpd
important       traceroute
important       udev
important       vim-common
important       wget
important       whiptail
required        base-files
required        base-passwd
required        bash
required        bsdutils
required        coreutils
required        debianutils
required        diff
required        dpkg
required        dselect
required        e2fslibs
required        e2fsprogs
required        findutils
required        gcc-4.1-base
required        gcc-4.2-base
required        gcc-4.3-base
required        grep
required        gzip
required        hostname
required        initscripts
required        libacl1
required        libattr1
required        libblkid1
required        libc6
required        libcap1
required        libcomerr2
required        libdevmapper1.02
required        libdevmapper1.02.1
required        libgcc1
required        liblocale-gettext-perl
required        libncurses5
required        libpam0g
required        libpam-modules
required        libpam-runtime
required        libselinux1
required        libsepol1
required        libslang2
required        libss2
required        libstdc++6
required        libtext-charwidth-perl
required        libtext-iconv-perl
required        libtext-wrapi18n-perl
required        libuuid1
required        login
required        lsb-base
required        makedev
required        mawk
required        mktemp
required        mount
required        ncurses-base
required        ncurses-bin
required        passwd
required        perl-base
required        procps
required        sed
required        slang1a-utf8
required        sysvinit
required        sysvinit-utils
required        sysv-rc
required        tar
required        tzdata
required        util-linux
required        zlib1g
standard        at
standard        bc
standard        bin86
standard        bind9-host
standard        bison
standard        dc
standard        dictionaries-common
standard        dnsutils
standard        doc-debian
standard        doc-linux-text
standard        exim4
standard        exim4-base
standard        exim4-config
standard        exim4-daemon-light
standard        file
standard        finger
standard        flex
standard        ftp
standard        gettext-base
standard        gnu-efi
standard        iamerican
standard        ibritish
standard        less
standard        libbind9-30
standard        libc6-amd64
standard        libdb4.2
standard        libdb4.3
standard        libdb4.4
standard        libdb4.5
standard        libdb4.6
standard        libdns16
standard        libdns32
standard        libevent1
standard        libgc1
standard        libgc1c2
standard        libgpmg1
standard        libgssapi2
standard        libident
standard        libidn11
standard        libisc32
standard        libisc7
standard        libkrb53
standard        liblockfile1
standard        liblwres1
standard        liblwres30
standard        libmagic1
standard        libnewt0.51
standard        libnfsidmap1
standard        libnfsidmap2
standard        libnss-db
standard        libreadline4
standard        librpcsecgss3
standard        libssp0
standard        libtextwrap1
standard        locales
standard        lpr
standard        lsof
standard        m4
standard        mailx
standard        make
standard        mime-support
standard        mpack
standard        mtools
standard        mtr-tiny
standard        mutt
standard        ncurses-term
standard        nfs-common
standard        openbsd-inetd
standard        openssh-client
standard        patch
standard        pciutils
standard        perl
standard        perl-modules
standard        pidentd
standard        portmap
standard        procmail
standard        python
standard        python2.3
standard        python-central
standard        python-minimal
standard        python-support
standard        readline-common
standard        reportbug
standard        sharutils
standard        slang1
standard        strace
standard        tcsh
standard        telnet
standard        texinfo
standard        time
standard        update-inetd
standard        w3m
standard        wamerican
standard        whois