This problem went away when I added udev_log="debug" to /etc/udev/udev.conf and ran update-initramfs -u. (Aside: someone more knowledgeable please update the advice on https://wiki.ubuntu.com/DebuggingLvm.)
Here is an almost-minimal sequence: 1) do a fresh install. 2) reboot into the new system. The problem occurs. Type "vgchange -ay; exit" at the (initramfs) prompt. 3) log in and apply the fix for #1467151. Without this, /boot is not available and I can't update-initramfs. (For a truly minimal sequence I should roll an updated udev package, so the fix would be applied in step 1 instead.) 4) reboot. The problem occurs again. 5) log in and run "update-initramfs -u". 6) reboot. The problem is gone. Conclusion: this looks like a debian-installer issue. Some excerpts from /var/log/installer/syslog: Jun 20 19:26:38 in-target: Setting up linux-image-3.19.0-22-generic (3.19.0-22.22) ... Jun 20 19:26:38 in-target: Running depmod. Jun 20 19:26:40 in-target: update-initramfs: deferring update (hook will be called later) [...] Jun 20 19:26:40 in-target: update-initramfs: Generating /boot/initrd.img-3.19.0-22-generic [...] Jun 20 19:27:17 in-target: Unpacking watershed (7) ... Jun 20 19:27:17 in-target: Selecting previously unselected package lvm2. Jun 20 19:27:17 in-target: Preparing to unpack .../lvm2_2.02.111-2ubuntu1_i386.deb ... Jun 20 19:27:17 in-target: Unpacking lvm2 (2.02.111-2ubuntu1) ... [...] Jun 20 19:27:18 in-target: Setting up watershed (7) ... Jun 20 19:27:18 in-target: update-initramfs: deferring update (trigger activated) Jun 20 19:27:18 in-target: Setting up liblvm2cmd2.02:i386 (2.02.111-2ubuntu1) ... Jun 20 19:27:19 in-target: Setting up dmeventd (2:1.02.90-2ubuntu1) ... Jun 20 19:27:20 in-target: Setting up lvm2 (2.02.111-2ubuntu1) ... Jun 20 19:27:20 in-target: update-initramfs: deferring update (trigger activated) [...] Jun 20 19:27:22 in-target: Processing triggers for initramfs-tools (0.103ubuntu15) ... Jun 20 19:27:22 in-target: update-initramfs: Generating /boot/initrd.img-3.19.0-22-generic [...] Jun 20 19:27:42 in-target: update-initramfs: Generating /boot/initrd.img-3.19.0-22-generic [...] Jun 20 19:35:48 pkgsel: finishing up Jun 20 19:35:48 net/hw-detect.hotplug: Detected hotpluggable network interface eth0 Jun 20 19:35:48 net/hw-detect.hotplug: Detected hotpluggable network interface lo Jun 20 19:36:06 main-menu[198]: (process:9551): update-initramfs: Generating /boot/initrd.img-3.19.0-22-generic Jun 20 19:36:07 main-menu[198]: DEBUG: resolver (libgcc1): package doesn't exist (ignored) Jun 20 19:36:08 main-menu[198]: INFO: Menu item 'grub-installer' selected Jun 20 19:36:08 grub-installer: info: architecture: i386/generic Jun 20 19:36:08 grub-installer: info: Mounting /proc into /target [...] Jun 20 19:37:16 finish-install: info: Running /usr/lib/finish-install.d/10update-initramfs [...] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1467153 Title: LVM VG not activated at boot, no snapshots used To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1467153/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
