All menu items are greyed out and no disks are shown

By comparison, GParted works normally

Thanks for this report.
Hum, need to see at the package responsible of this software... Maybe a hidden systemd dependency is present...
Mounting all the partitions manually and using genfastab to creat a proper fstab would fix the issue, despite of automounting not working.
23 days later
i did some test on a VM.
So, i tried to start it with regular user from a terminal, i got a bunch of error about permissions.
So, i tried to start it with root from a terminal. I used consolekit and apparently, it doesn't found the dbus-session.
i connected to root with su then i did 
# export $(dbus-launch)
# partitionmanager
I got it running and showing the partition

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