Lubuntu 11.10, upgrading to 12.04, on VirtualBox.
upgrade way : update-manager -d
Archi 32bits
Configuring libc6
xscreensaver and xlockmore must be restarted before upgrading
One or more running instances of xscreensaver or xlockmore have been detected on this system. Because of incompatible library changes, the upgrade of the GNU libc library will leave you unable to authenticate to these programs. You should arrange for these programs to be restarted or stopped before continuing this upgrade, to avoid locking your users out of their current sessions.
Lubuntu 11.10, upgrading to 12.04, on VirtualBox.
upgrade way : update-manager -d
Archi 32bits
Configuring libc6
xscreensaver and xlockmore must be restarted before upgrading
One or more running instances of xscreensaver or xlockmore have been detected on this system. Because of incompatible library changes, the upgrade of the GNU libc library will leave you unable to authenticate to these programs. You should arrange for these programs to be restarted or stopped before continuing this upgrade, to avoid locking your users out of their current sessions.
The bug doesn't block the install process