Public bug reported: I recently upgraded to 3.19.0-30-generic and booting my laptop has started freezing at the encryption prompt. I found https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1502598 which seems to describe the same problem. I followed the instructions in #4 and was able to successfully boot with the 4.3.0-040300rc4-generic kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-rc4-unstable/.
Note that the logs in this report are from 3.19.0-15-generic which I had to boot into to run `ubuntu-bug`. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.19.0-15-generic 3.19.0-15.15 [modified: boot/vmlinuz-3.19.0-15-generic] ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3 Uname: Linux 3.19.0-15-generic x86_64 ApportVersion: 2.17.2-0ubuntu1.5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: brb 1458 F.... pulseaudio /dev/snd/controlC0: brb 1458 F.... pulseaudio CurrentDesktop: Unity Date: Sun Oct 4 21:52:43 2015 HibernationDevice: RESUME=UUID=cc858711-9333-4c0c-818c-f33eb1bf03b3 InstallationDate: Installed on 2015-10-05 (0 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) MachineType: LENOVO 20CMCTO1WW ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash RelatedPackageVersions: linux-restricted-modules-3.19.0-15-generic N/A linux-backports-modules-3.19.0-15-generic N/A linux-firmware 1.143.3 SourcePackage: linux UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/20/2015 dmi.bios.vendor: LENOVO dmi.bios.version: N10ET38W (1.17 ) dmi.board.asset.tag: Not Available dmi.board.name: 20CMCTO1WW dmi.board.vendor: LENOVO dmi.board.version: SDK0K11826 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrN10ET38W(1.17):bd08/20/2015:svnLENOVO:pn20CMCTO1WW:pvrThinkPadX250:rvnLENOVO:rn20CMCTO1WW:rvrSDK0K11826WIN:cvnLENOVO:ct10:cvrNone: dmi.product.name: 20CMCTO1WW dmi.product.version: ThinkPad X250 dmi.sys.vendor: LENOVO ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed ** Tags: amd64 apport-bug kernel-fixed-upstream kernel-fixed-upstream-4.3-rc4 vivid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1502754 Title: Boot hangs on 3.19.0-30 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1502754/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs