booting in insecure mode,ACPI exceptions in dmesg, stuck at splash

[Nandha Kumar]

at the start displays "Booting in insecure mode" i press some random button during splash animation ,which opens a visual terminal loading all process succesfully except"ntp failure use systemcl for info" and i get past splash to lightdm greeter or else stuck at splash.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: shim 0.7-0ubuntu4
ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8
Uname: Linux 3.16.0-34-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed May 13 20:38:55 2015
Dependencies:

InstallationDate: Installed on 2015-04-14 (29 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: shim
UpgradeStatus: No upgrade log present (probably fresh install)