Comment 2 for bug 1615286

"Using a Unity desktop", you mean, with a different display manager?

I installed Xubuntu 16.04 on my laptop and there I had an issue with xflocker and mouse pointer disappearing (already reported by someone), so they suggested changing the display manager. I installed gdm and use it instead, and the problem was solved. So I tried installing gdm in my Linux Mint and setting it as default, but then on reboot I did not have a graphical session anymore. I then tried installing lightdm, and once again, some weird error and I couldn't login. startx still worked though, so I found out about mdm, which for some reason was not installed (though I thought it was being used), so installed it, then ran mdmsetup, configured the most basic GTK login window, and was finally able to boot with a graphical environment by default. I didn't report it as a bug because it's hard to reproduce. So I'm a bit afraid of trying it again, but I will do it nevertheless.