When I used Ubuntu 15.04 with bluez5 from PPA installed, the mouse works. But after installing Ubuntu 15.04, the mouse doesn't work.
[bluetooth]# info XX:XX:XX:XX:XX
Device XX:XX:XX:XX:XX
Name: MX Anywhere 2
Alias: MX Anywhere 2
Icon: input-mouse
Paired: yes
Trusted: yes
Blocked: no
Connected: yes
LegacyPairing: no
bluez5 have already included in ubuntu 15.10. The mouse paring and connecting seem fine but the mouse doesn't do anything.
$dpkg -l | grep bluez
ii bluez 5.35-0ubuntu2 amd64 Bluetooth tools and daemons