"start job is running" hangs boot until timeout

[Barry Warsaw]

Booting a freshly dist-upgraded vivid, I see the following console messages with a red spinner hang the boot process until the first one reaches its timeout:

(1 of 2) A start job is running for dev-mapper-cryptswap1.device (34s / no limit)
(2 of 2) A start job is running for dev-sdb1.device (36s / 1min 30s)

Eventually:

Timed out waiting for device dev-sdb1.device.
[ESC[1;33mDEPENDESC[0m] Dependency failed for Cryptography Setup for cryptswap1.
[ESC[1;33mDEPENDESC[0m] Dependency failed for /dev/mapper/cryptswap1.
[ESC[1;33mDEPENDESC[0m] Dependency failed for Swap.
[ESC[1;33mDEPENDESC[0m] Dependency failed for Encrypted Volumes.

then the boot continues. AFAICT, there are no ill effects on the post-boot system.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: systemd 219-6ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-11.11-generic 3.19.3
Uname: Linux 3.19.0-11-generic x86_64
ApportVersion: 2.17-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Apr 3 11:22:16 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2011-07-12 (1360 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110705.1)
MachineType: Dell Inc. Studio XPS 435MT
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-11-generic root=UUID=7ffae0c6-66ea-4bbd-ae3d-f98ddd9603a5 ro nomdmonddf nomdmonisw
SourcePackage: systemd
SystemImageInfo:
 current build number: 0
 device name:
 channel: daily
 last update: Unknown
UpgradeStatus: Upgraded to vivid on 2011-12-23 (1196 days ago)
dmi.bios.date: 05/05/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.1.1
dmi.board.name: 0R849J
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.1.1:bd05/05/2009:svnDellInc.:pnStudioXPS435MT:pvr:rvnDellInc.:rn0R849J:rvrA03:cvnDellInc.:ct3:cvr:
dmi.product.name: Studio XPS 435MT
dmi.sys.vendor: Dell Inc.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Graeme Jackson (zogg-get-safe)]

I don't believe this is a duplicate of https://bugs.launchpad.net/bugs/953875.

My install is clean ubuntu 15.04 MATE. No Encryption

I get this issue sportadically with my Home drive on a separate partition, it is a clean home - not carried over from previous install, and it is not encrypted.

If I move the home folder to the local partition the boot works - it's still frighteningly slow, but it works.