Had the same problem. Solution provided in Bug #496733 worked for me ! (RememberPowered = false in /etc/bluetooth/main.conf)
Blueman 1.21 -- Can't turn Bluetooth back on https://bugs.launchpad.net/bugs/411481 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs