I had this problem. I've installed linux-image-4.1.0-040100rc4-generic_4.1.0-040100rc4.201505181436_amd64.deb and now it's fixed.
I had this problem. I've installed linux-image- 4.1.0-040100rc4 -generic_ 4.1.0-040100rc4 .201505181436_ amd64.deb and now it's fixed.