I've just tried to upgrade my system and got some very strange result: 665 packages skipped. What could be the reason? I have some old PHP installed to keep in sync with live servers but the rest of packages?
Reading package lists...
Building dependency tree...
Reading state information...
The following packages have been kept back:
account-plugin-aim account-plugin-jabber account-plugin-salut
account-plugin-yahoo accountsservice acpid alsa-utils anacron apparmor
appmenu-qt5 apport apt apt-transport-https apt-utils aptdaemon aptitude
aptitude-common apturl apturl-common argyll avahi-daemon bamfdaemon bluez
brasero brasero-cdrkit brasero-common brltty bsdutils cabextract cheese
cheese-common colord compiz compiz-core compiz-gnome compiz-plugins-default
console-setup cpp cron cups cups-browsed cups-bsd cups-client
cups-core-drivers cups-daemon cups-filters cups-filters-core-drivers curl
dbus deja-dup dnsmasq dnsmasq-base dpkg empathy empathy-common eog evince
evince-common evolution evolution-common evolution-data-server
evolution-data-server-common evolution-data-server-online-accounts
evolution-indicator evolution-plugins exo-utils file-roller fonts-thai-tlwg
friendly-recovery g++ gcc gcc-4.9-base gcc-4.9-base:i386 gdb gdisk gdm geany
geany-common gettext gir1.2-accountsservice-1.0 gir1.2-clutter-1.0
gir1.2-cogl-1.0 gir1.2-coglpango-1.0 gir1.2-ebook-1.2
gir1.2-ebookcontacts-1.2 gir1.2-edataserver-1.2 gir1.2-evince-3.0
gir1.2-gck-1 gir1.2-gcr-3 gir1.2-gdata-0.0 gir1.2-gdm-1.0
gir1.2-gnomedesktop-3.0 gir1.2-gnomekeyring-1.0 gir1.2-goa-1.0
gir1.2-gtk-3.0 gir1.2-gtksource-3.0 gir1.2-gtop-2.0 gir1.2-ibus-1.0
gir1.2-mutter-3.0 gir1.2-networkmanager-1.0 gir1.2-nmgtk-1.0 gir1.2-rb-3.0
gir1.2-secret-1 gir1.2-totem-1.0 gir1.2-upowerglib-1.0 glib-networking
glib-networking:i386 glib-networking-common glib-networking-services
gnome-backgrounds gnome-calculator gnome-color-manager gnome-contacts
gnome-control-center gnome-control-center-data gnome-disk-utility
gnome-documents gnome-font-viewer gnome-keyring gnome-mahjongg gnome-mines
gnome-online-accounts gnome-online-miners gnome-orca gnome-power-manager
gnome-screensaver gnome-session gnome-session-bin gnome-session-common
gnome-settings-daemon gnome-settings-daemon-schemas gnome-shell
gnome-shell-common gnome-shell-extensions gnome-sudoku gnome-sushi
gnome-system-monitor gnome-terminal gnome-terminal-data
gnome-themes-standard gnome-themes-standard-data gnome-tweak-tool
grilo-plugins-0.2 gsettings-desktop-schemas gstreamer1.0-clutter
gstreamer1.0-plugins-good gstreamer1.0-plugins-good:i386 gvfs gvfs-backends
gvfs-backends-goa gvfs-bin gvfs-common gvfs-daemons gvfs-fuse gvfs-libs
hplip hplip-data hud humanity-icon-theme ibus ibus-pinyin icu-devtools
ifupdown indicator-appmenu indicator-datetime indicator-keyboard
init-system-helpers initscripts irqbalance isc-dhcp-client isc-dhcp-common
keyboard-configuration kmod lib32gcc1 libaacs0 libaccount-plugin-1.0-0
libaccounts-qt5-1 libaccountsservice0 libalgorithm-diff-xs-perl
libapparmor-perl libapt-pkg-perl libapt-pkg4.12 libatkmm-1.6-1 libatomic1
libav-tools libbamf3-2 libbrasero-media3-1 libc-bin libc-dev-bin libc6
libc6:i386 libc6-dbg libc6-dev libc6-i386 libcheese-gtk23 libcheese7
libchromaprint0 libclone-perl libcloog-isl4 libclutter-1.0-0
libclutter-gst-2.0-0 libclutter-gtk-1.0-0 libcolord-gtk1 libcolumbus1
libcolumbus1-common libcompizconfig0 libcompress-raw-bzip2-perl
libcompress-raw-lzma-perl libcompress-raw-zlib-perl libcups2 libcups2:i386
libcupscgi1 libcupsimage2 libcupsmime1 libcupsppdc1 libcurl3 libcurl3-gnutls
libcwidget3 libdbd-mysql-perl libdbi-perl libdecoration0 libdirac-encoder0
libebackend-1.2-7 libebook-1.2-14 libecal-1.2-16 libedata-book-1.2-20
libedata-cal-1.2-23 libedataserver-1.2-18 libegl1-mesa libept1.4.12
libevdocument3-4 libevolution libevview3-3 libexo-1-0 libfftw3-single3
libfile-fcntllock-perl libfreerdp-plugins-standard libgail-3-0 libgarcon-1-0
libgbm1 libgcc1 libgcc1:i386 libgcr-base-3-1 libgcr-ui-3-1 libgdm1
libgexiv2-2 libgl1-mesa-dri libgl1-mesa-dri:i386 libglibmm-2.4-1c2a
libgnome-keyring-common libgnome-keyring0 libgnomevfs2-0 libgnutls-openssl27
libgoa-1.0-0b libgoa-1.0-common libgoa-backend-1.0-1 libgomp1 libgpod-common
libgpod4 libgstreamer-plugins-good1.0-0 libgstreamer-plugins-good1.0-0:i386
libgtk-3-0 libgtk-3-bin libgtkhtml-4.0-0 libgtkhtml-4.0-common
libgtkhtml-editor-4.0-0 libgtkmm-2.4-1c2a libgtkmm-3.0-1
libgtksourceview-3.0-1 libgweather-3-6 libhpmud0 libhtml-parser-perl libhud2
libicu-dev libicu52 libimobiledevice4 libio-compress-lzma-perl
libio-compress-perl libio-pty-perl libitm1 libjavascriptcoregtk-3.0-0
libldap-2.4-2 libldb1 liblist-moreutils-perl libllvm3.4 libllvm3.6
libllvm3.6:i386 liblocale-gettext-perl liblog-message-simple-perl
libmm-glib0 libmtp-runtime libmtp9 libneon27-gnutls libnet-dns-perl
libnet-libidn-perl libnet-ssleay-perl libnetaddr-ip-perl libnm-glib4
libnm-gtk-common libnm-gtk0 libnm-util2 libnux-4.0-0 libnux-4.0-common
libpam-modules libpam-modules-bin libpam-systemd libpangomm-1.4-1
libperlio-gzip-perl libpolkit-backend-1-0 libpolkit-gobject-1-0
libpoppler-glib8 libproxy1 libproxy1:i386 libproxy1-plugin-gsettings
libproxy1-plugin-networkmanager libpulse-mainloop-glib0 libpulse0
libpulse0:i386 libpulsedsp libpurple0 libpython-stdlib libpython2.7
libpython2.7-minimal libpython2.7-stdlib libqpdf13 libqt4-dbus
libqt4-dbus:i386 libqt4-declarative libqt4-declarative:i386 libqt4-designer
libqt4-help libqt4-network libqt4-network:i386 libqt4-opengl
libqt4-opengl:i386 libqt4-script libqt4-script:i386 libqt4-scripttools
libqt4-sql libqt4-sql:i386 libqt4-sql-mysql:i386 libqt4-sql-sqlite
libqt4-svg libqt4-test libqt4-xml libqt4-xml:i386 libqt4-xmlpatterns
libqt4-xmlpatterns:i386 libqt5core5a libqt5dbus5 libqt5feedback5 libqt5gui5
libqt5multimedia5 libqt5network5 libqt5opengl5 libqt5organizer5
libqt5positioning5 libqt5printsupport5 libqt5qml-graphicaleffects libqt5qml5
libqt5quick5 libqt5sensors5 libqt5sql5 libqt5sql5-sqlite libqt5svg5
libqt5test5 libqt5webkit5 libqt5webkit5-qmlwebkitplugin libqt5widgets5
libqt5xml5 libqtcore4 libqtcore4:i386 libqtdbus4 libqtdbus4:i386 libqtgui4
libqtgui4:i386 libquadmath0 libreoffice-avmedia-backend-gstreamer
libreoffice-base-core libreoffice-calc libreoffice-common libreoffice-core
libreoffice-draw libreoffice-gnome libreoffice-gtk libreoffice-help-en-gb
libreoffice-help-en-us libreoffice-impress libreoffice-l10n-en-gb
libreoffice-l10n-en-za libreoffice-math libreoffice-pdfimport
libreoffice-style-human libreoffice-style-tango libreoffice-writer
librhythmbox-core8 libsane-hpaio libsecret-1-0 libsignon-extension1
libsmbclient libsnmp30 libsocket6-perl libssh2-1 libstdc++6 libstdc++6:i386
libsub-identify-perl libsub-name-perl libtag1-vanilla libtag1-vanilla:i386
libtag1c2a libtag1c2a:i386 libterm-readkey-perl libtext-charwidth-perl
libtext-iconv-perl libtext-soundex-perl libthunarx-2-0 libtimezonemap1
libtirpc1 libtotem-plparser18 libtotem0 libtsan0 libudev1 libudev1:i386
libunity-core-6.0-9 libunityvoice1 libusbmuxd2 libuuid-perl libva1 libvlc5
libvncserver0 libwacom-common libwacom2 libwayland-egl1-mesa
libwebkitgtk-3.0-0 libwhoopsie-preferences0 libwhoopsie0 libxapian22
libxfce4ui-1-0 libxfce4ui-utils libxfce4util-bin libxml2 libxml2:i386
libxslt1.1 libxslt1.1:i386 lightdm lighttpd linux-headers-generic lm-sensors
lsb-base lshw mcp-account-manager-goa mcp-account-manager-uoa
metacity-common modemmanager mount mountall mplayer2 mutter mutter-common
mysql-common mysql-server mysql-workbench mysql-workbench-data nautilus
nautilus-data network-manager network-manager-gnome network-manager-pptp
network-manager-pptp-gnome nfs-common ntfs-3g nvidia-prime onboard orage
parted perl perl-base perl-modules php-pear php5-cgi php5-cli php5-common
php5-curl php5-dev php5-gd php5-mysql php5-tidy php5-xsl pidgin plymouth
plymouth-label plymouth-theme-ubuntu-text poppler-utils ppp
printer-driver-foo2zjs printer-driver-foo2zjs-common printer-driver-hpcups
printer-driver-postscript-hp procps pulseaudio pulseaudio-module-bluetooth
pulseaudio-module-x11 pulseaudio-utils python python-apt python-aptdaemon
python-aptdaemon.gtk3widgets python-ldb python-lxml python-minimal
python-paramiko python-pycurl python-requests python-samba
python-twisted-core python-twisted-web python-urllib3 python-xapian
python2.7 python2.7-minimal python3-apt python3-aptdaemon
python3-aptdaemon.gtk3widgets python3-aptdaemon.pkcompat python3-distupgrade
python3-lxml python3-uno qdbus qpdf qtchooser qtdeclarative5-accounts-plugin
qtdeclarative5-dialogs-plugin qtdeclarative5-localstorage-plugin
qtdeclarative5-privatewidgets-plugin qtdeclarative5-qtfeedback-plugin
qtdeclarative5-qtquick2-plugin
qtdeclarative5-ubuntu-ui-extras-browser-plugin
qtdeclarative5-ubuntu-ui-toolkit-plugin qtdeclarative5-window-plugin remmina
remmina-common remmina-plugin-rdp remmina-plugin-vnc resolvconf rfkill
rhythmbox rhythmbox-data rhythmbox-mozilla rhythmbox-plugin-cdrecorder
rhythmbox-plugin-magnatune rhythmbox-plugin-zeitgeist rhythmbox-plugins
rpcbind rsyslog rtmpdump ruby samba-common samba-common-bin samba-libs
seahorse shotwell shotwell-common signon-plugin-oauth2 signon-ui signond
simple-scan smbclient spamassassin system-config-printer-common
system-config-printer-gnome system-config-printer-udev systemd-shim
telepathy-gabble telepathy-salut thunar thunar-data thunar-volman totem
totem-common totem-plugins tracker tracker-extract tracker-miner-fs
tracker-utils transmission-common transmission-gtk ubuntu-desktop
ubuntu-drivers-common ubuntu-gnome-desktop ubuntu-gnome-wallpapers
ubuntu-minimal ubuntu-mono ubuntu-release-upgrader-core
ubuntu-release-upgrader-gtk ubuntu-session ubuntu-standard ubuntu-wallpapers
udev udisks2 ufw unattended-upgrades unity unity-asset-pool
unity-control-center unity-control-center-signon unity-greeter
unity-services unity-settings-daemon unity-voice-service unity-webapps-qml
uno-libs3 upower upstart ure ureadahead usbmuxd util-linux
util-linux-locales uuid-runtime vino vlc vlc-data vlc-nox vlc-plugin-notify
vlc-plugin-pulse webapp-container webbrowser-app whoopsie
whoopsie-preferences xdiagnose xfce4-appfinder xfce4-mixer xfce4-notifyd
xfce4-panel xfce4-session xfce4-settings xfconf xfdesktop4 xfdesktop4-data
xfwm4 xorg xserver-xephyr xserver-xorg 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-ati xserver-xorg-video-cirrus
xserver-xorg-video-fbdev xserver-xorg-video-mach64 xserver-xorg-video-mga
xserver-xorg-video-openchrome xserver-xorg-video-qxl xserver-xorg-video-r128
xserver-xorg-video-radeon xserver-xorg-video-s3 xserver-xorg-video-savage
xserver-xorg-video-siliconmotion xserver-xorg-video-tdfx
xserver-xorg-video-vesa xserver-xorg-video-vmware zeitgeist-core
0 upgraded, 0 newly installed, 0 to remove and 665 not upgraded.