Comment 4 for bug 1007757

But if i am trying to upgrade 10.10 to 11.04 i am getting this error "Error authenticating some packages"
Please help me solve this problem ;

the exact error message follows;
"
Error authenticating some packages

It was not possible to authenticate some packages. This may be a transient network problem. You may want to try again later. See below for a list of unauthenticated packages.

app-install-data
app-install-data-partner
apport
apport-gtk
bamfdaemon
banshee
banshee-extension-soundmenu
banshee-extension-ubuntuonemusicstore
binutils
byobu
compiz
compiz-core
compiz-fusion-plugins-main
compiz-gnome
compiz-plugins
compiz-plugins-main
desktopcouch
dpkg
dpkg-dev
ecryptfs-utils
file-roller
foo2zjs
gir1.2-dbusmenu-glib-0.4
gir1.2-panelapplet-3.0
glib-networking
gnome-keyring
gnome-nettool
gnome-panel
gnome-panel-bonobo
gnome-panel-data
gnome-power-manager
gnome-session
gnome-session-bin
gnome-session-common
gnome-user-guide
grub-gfxpayload-lists
gstreamer0.10-tools
gvfs
gvfs-backends
gvfs-bin
gvfs-fuse
gwibber
gwibber-service
gwibber-service-facebook
gwibber-service-identica
gwibber-service-twitter
initramfs-tools
initramfs-tools-bin
initscripts
language-pack-en
language-pack-en-base
language-pack-gnome-en
language-pack-gnome-en-base
language-selector
language-selector-common
language-selector-gnome
libbamf0
libdbusmenu-glib3
libdbusmenu-gtk3
libdecoration0
libdpkg-perl
libecryptfs0
libgcr0
libgksu2-0
libgl1-mesa-dri
libgl1-mesa-glx
libglu1-mesa
libgp11-0
libgpod-common
libgpod4
libgstreamer0.10-0
libgvfscommon0
libgweather-common
libgweather1
libimobiledevice2
liblircclient0
libnux-0.9-0
libnux-0.9-common
liboverlay-scrollbar-0.1-0
libpam-gnome-keyring
libpanel-applet-3-0
libpanel-applet2-0
libplymouth2
libpoppler-glib6
libpoppler13
libpulse-browse0
libpulse-mainloop-glib0
libpulse0
libreoffice-base-core
libreoffice-calc
libreoffice-common
libreoffice-core
libreoffice-draw
libreoffice-emailmerge
libreoffice-gnome
libreoffice-gtk
libreoffice-help-en-us
libreoffice-impress
libreoffice-math
libreoffice-style-human
libreoffice-writer
libtelepathy-logger2
light-themes
mobile-broadband-provider-info
nautilus-sendto
ntpdate
nux-tools
nvidia-common
openoffice.org-calc
openoffice.org-common
openoffice.org-draw
openoffice.org-emailmerge
openoffice.org-gnome
openoffice.org-gtk
openoffice.org-help-en-us
openoffice.org-impress
openoffice.org-math
openoffice.org-writer
overlay-scrollbar
plymouth
plymouth-label
plymouth-theme-ubuntu-logo
plymouth-theme-ubuntu-text
plymouth-x11
poppler-utils
pulseaudio
pulseaudio-esound-compat
pulseaudio-module-bluetooth
pulseaudio-module-gconf
pulseaudio-module-x11
pulseaudio-utils
python
python-apport
python-apt
python-apt-common
python-desktopcouch
python-desktopcouch-application
python-desktopcouch-records
python-desktopcouch-recordtypes
python-dev
python-glade2
python-gobject
python-gobject-cairo
python-gtk2
python-launchpadlib
python-minimal
python-papyon
python-problem-report
python-ubuntuone-control-panel
python-uno
rhythmbox
rhythmbox-plugin-cdrecorder
rhythmbox-plugins
shotwell
software-center
sysv-rc
sysvinit-utils
telepathy-logger
tomboy
ttf-opensymbol
tzdata
ubuntu-docs
ubuntuone-control-panel
ubuntuone-control-panel-gtk
udisks
unity
unity-common
unity-place-applications
unity-place-files
uno-libs3
ure
whois
xserver-xorg-input-synaptics
xserver-xorg-video-ati
xserver-xorg-video-intel
xserver-xorg-video-radeon
"

Thanks in advance !!