It turns out that the "dirname not found" error is a red herring because it also occurs with previous kernel and doesn't prevent booting.
With the problematic kernel, giving the wrong password doesn't ask to enter the password so it seems it's not even verified. So whatever the password used, the boot sequence just stops, nothing happens. -- 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/1523155 Title: [regression] 3.13.0-72.115 unable to boot with root FS under LUKS Status in linux package in Ubuntu: Confirmed Bug description: Early in boot, I see this: Mounting root file system ... Begin: Running /script/local-top ... /script/local-top/cryptroot: line 24: dirname not found Then get prompted to enter the LUKS password. Once I entered the right password, nothing happens, not even any disk activity. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-72-generic 3.13.0-72.115 ProcVersionSignature: Ubuntu 3.13.0-71.114-generic 3.13.11-ckt29 Uname: Linux 3.13.0-71-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: simon 4916 F.... pulseaudio Date: Sat Dec 5 15:18:05 2015 HibernationDevice: RESUME=UUID=8e7a3220-158f-413b-81b2-55b236bb1f3f InstallationDate: Installed on 2014-01-26 (677 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140124) MachineType: LENOVO 2516CTO ProcEnviron: LANGUAGE=en_US TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-71-generic root=/dev/mapper/crypt-root ro quiet splash cryptopts=target=crypt,source=/dev/sda1,lvm=crypt-root possible_cpus=4 nmi_watchdog=0 vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.13.0-71-generic N/A linux-backports-modules-3.13.0-71-generic N/A linux-firmware 1.127.19 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/14/2013 dmi.bios.vendor: LENOVO dmi.bios.version: 6IET85WW (1.45 ) dmi.board.name: 2516CTO dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvr6IET85WW(1.45):bd02/14/2013:svnLENOVO:pn2516CTO:pvrThinkPadT410:rvnLENOVO:rn2516CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 2516CTO dmi.product.version: ThinkPad T410 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1523155/+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