Comment 10 for bug 534200

Same error here. Trying to update from Hardy to Lucid via ssh.

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.

apt
apt-transport-https
apt-utils
ghostscript
ghostscript-x
grub-common
gs
gs-common
gs-esp
libapache2-mod-php5
libcups2
libcupsimage2
libgl1-mesa-dev
libgl1-mesa-glx
libglib2.0-0
libglib2.0-data
libglib2.0-dev
libglu1-mesa
libglu1-mesa-dev
libgs8
libgtk2.0-0
libgtk2.0-bin
libgtk2.0-common
librsvg2-2
mesa-common-dev
mountall
openssh-client
openssh-server
php5-common
python-apt
tzdata
update-manager-core

Restoring original system state

Aborting
Reading package lists: Donehardy-security/multiverse Packages: 98
Reading state information: Done
Reading state information: Done
Reading state information: Done