Thanks for your report.
Have you locked you root account (either with passwd -l or passwd -e)?
If so then this is likely a dup of bug 238755
For the moment a workaround is to run
sudo passwd --unlock root
sudo usermod --lock root
then replay your upgrade.
** Changed in: landscape-client (Ubuntu)
Status: New => Incomplete
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"landscape-client" error, upgrade to 8.10 beta
https://bugs.launchpad.net/bugs/278518
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