Thanks Christopher. This bug is invalid. It turned out that the bug existed in fglrx, not in the kernel. See https://launchpad.net/bugs/1479913
** Changed in: linux (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1486020 Title: Ubuntu boots to CLI tty1 instead of unity-greeter after latest kernel update Status in linux package in Ubuntu: Invalid Bug description: After updating to kernel 3.19.0-26.28, Ubuntu no longer boots to unity-greeter, instead, it boots to CLI tty1. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.19.0-26-generic 3.19.0-26.28~14.04.1 ProcVersionSignature: Ubuntu 3.19.0-26.28~14.04.1-generic 3.19.8-ckt4 Uname: Linux 3.19.0-26-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.14.1-0ubuntu3.11 Architecture: amd64 Date: Tue Aug 18 14:16:45 2015 InstallationDate: Installed on 2015-06-16 (62 days ago) InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1) SourcePackage: linux-lts-vivid UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1486020/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp