[Bug 1450858] Re: fails to mount when installing ubuntu server from usb device

[Daniel Dehennin]

I burn the Ubuntu Server 14.04.2 (amd64) to my USB stick using dd.

I say that the problem is only triggered when the target disk has no
mountable partition.

If the target disk contains a mountable partition, then it is mounted
under /media and the usb stick can be mounted under /cdrom.

It looks like the check-missing-firmware mount what ever it found under
/media[1], which results in the second partition for my USB stick, which
is not automatically unmounted before the call to cdrom-detect.

Regards.

[1] https://bazaar.launchpad.net/~ubuntu-
branches/ubuntu/trusty/mountmedia/trusty/view/head:/mountmedia#L14


May  6 07:35:35 kernel: [    4.100075] random: nonblocking pool is initialized
May  6 07:35:35 preseed: successfully loaded preseed file from file:///preseed.cfg
May  6 07:35:36 init: starting pid 1071, tty '': '/sbin/reopen-console /sbin/debian-installer'
May  6 07:35:36 init: starting pid 1074, tty '/dev/tty4': '/usr/bin/tail -f /var/log/syslog'
May  6 07:35:36 debconf: Setting debconf/language to en
May  6 07:35:36 main-menu[1100]: DEBUG: resolver (libc6-udeb): package doesn't exist (ignored)
May  6 07:35:36 main-menu[1100]: INFO: Menu item 'cdrom-detect' selected
May  6 07:35:36 net/hw-detect.hotplug: Detected hotpluggable network interface lo
May  6 07:35:36 apt-install: Queueing package udev for later installation
May  6 07:35:36 apt-install: Queueing package pciutils for later installation
May  6 07:35:36 apt-install: Queueing package usbutils for later installation
May  6 07:35:37 apt-install: Queueing package eject for later installation
May  6 07:35:38 check-missing-firmware: /dev/.udev/firmware-missing does not exist, skipping
May  6 07:35:38 check-missing-firmware: /run/udev/firmware-missing does not exist, skipping
May  6 07:35:38 check-missing-firmware: no missing firmware in /dev/.udev/firmware-missing /run/udev/firmware-missing
May  6 07:35:38 cdrom-detect: Searching for Ubuntu installation media...
May  6 07:35:42 cdrom-detect: Devices: '/dev/sr0 /dev/sdb'
May  6 07:35:42 init: starting pid 1072, tty '/dev/tty2': '-/bin/sh'
May  6 07:35:42 cdrom-detect: CD-ROM mount failed: device=/dev/sr0 fstype=iso9660
May  6 07:35:42 cdrom-detect: CD-ROM mount failed: device=/dev/sdb fstype=iso9660
May  6 07:35:53 cdrom-detect: Unmounting CD just to be sure
May  6 07:35:53 cdrom-detect: CD-ROM mount failed: device=/dev/sr0 fstype=iso9660
May  6 07:35:53 cdrom-detect: CD-ROM mount failed: device=/dev/sdb fstype=iso9660
May  6 07:36:05 cdrom-detect: Unmounting CD just to be sure
May  6 07:36:05 cdrom-detect: CD-ROM mount failed: device=/dev/sr0 fstype=iso9660
May  6 07:36:05 kernel: [   34.322955] ISO 9660 Extensions: Microsoft Joliet Level 3
May  6 07:36:05 cdrom-detect: CD-ROM mount succeeded: device=/dev/sdb fstype=iso9660
May  6 07:36:05 kernel: [   34.326343] ISO 9660 Extensions: RRIP_1991A
May  6 07:36:05 cdrom-detect: Detected CD 'Ubuntu-Server 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)'
May  6 07:36:06 cdrom-detect: Detected CD with 'trusty' (trusty) distribution
May  6 07:36:06 anna-install: Queueing udeb eject-udeb for later installation
May  6 07:36:06 anna-install: Queueing udeb apt-mirror-setup for later installation
May  6 07:36:06 anna-install: Queueing udeb apt-cdrom-setup for later installation
May  6 07:36:06 anna-install: Queueing udeb trusty-support for later installation
May  6 07:36:06 main-menu[1100]: (process:1133): mount: mounting /dev/sr0 on /cdrom failed: No medium found
May  6 07:36:06 main-menu[1100]: (process:1133): mount: mounting /dev/sdb on /cdrom failed: Device or resource busy
May  6 07:36:06 main-menu[1100]: (process:1133): mount: mounting /dev/sr0 on /cdrom failed: No medium found
May  6 07:36:06 main-menu[1100]: (process:1133): mount: mounting /dev/sdb on /cdrom failed: Device or resource busy
May  6 07:36:06 main-menu[1100]: (process:1133): mount: mounting /dev/sr0 on /cdrom failed: No medium found
May  6 07:36:06 main-menu[1100]: DEBUG: resolver (libc6-udeb): package doesn't exist (ignored)
May  6 07:36:06 main-menu[1100]: INFO: Menu item 'file-preseed' selected
May  6 07:36:07 preseed: successfully loaded preseed file from file:///cdrom/preseed/ubuntu-server.seed

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https://bugs.launchpad.net/bugs/1450858

Title:
  fails to mount when installing ubuntu server from usb device

Status in debian-installer package in Ubuntu:
  Confirmed

Bug description:
  I created a USB installation device for Ubuntu Server 14.04.2 (amd64)
  using the "Startup Disk Creator".

  The USB device boots up successfully but the installation fails as the
  cd-rom can not be mounted.

  There is a workaround for this problem
  (http://askubuntu.com/a/609648/403981): Since the USB device /dev/sdc1
  was already mounted to /media, I had to unmount the device on a
  console. After this, the installation program could successfully mount
  /dev/sdc1 to /cdrom and the installation could be continued.

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