Comment 128 for bug 1292398

@Alberts this is still an issue in Xubuntu 18.04 :(

I have been battling with in xubuntu 16.04 and thought it would have been resolved by now...no love for xubuntu :(

root issue:
https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1283615

A Work around solution:
http://bernaerts.dyndns.org/linux/74-ubuntu/309-ubuntu-dual-display-monitor-position-lost#h1-setup-a-clean-configuration