Public bug reported:

Doing a install from 16.04 alpha disc and when I attempt to install it
crashes on the screen to do the partitioning.

Feb  4 18:07:15 lubuntu ubiquity[19194]: debconffilter_done: ubi-language 
(current: ubi-language)
Feb  4 18:07:15 lubuntu ubiquity[19194]: Step_before = stepLanguage
Feb  4 18:07:15 lubuntu ubiquity[19194]: Step_before = stepLanguage
Feb  4 18:07:15 lubuntu ubiquity[19194]: switched to page prepare
Feb  4 18:07:21 lubuntu ubiquity: Reading package lists...
Feb  4 18:07:21 lubuntu ubiquity: 
Feb  4 18:07:21 lubuntu ubiquity: Building dependency tree...
Feb  4 18:07:21 lubuntu ubiquity: 
Feb  4 18:07:21 lubuntu ubiquity: Reading state information...
Feb  4 18:07:21 lubuntu ubiquity: 
Feb  4 18:07:22 lubuntu ubiquity: The following additional packages will be 
installed:
Feb  4 18:07:22 lubuntu ubiquity:   iucode-tool
Feb  4 18:07:22 lubuntu ubiquity: The following NEW packages will be installed:
Feb  4 18:07:22 lubuntu ubiquity:   intel-microcode iucode-tool
Feb  4 18:07:22 lubuntu ubiquity: 0 upgraded, 2 newly installed, 0 to remove 
and 231 not upgraded.
Feb  4 18:07:22 lubuntu ubiquity: Need to get 498 kB of archives.
Feb  4 18:07:22 lubuntu ubiquity: After this operation, 663 kB of additional 
disk space will be used.
Feb  4 18:07:22 lubuntu ubiquity: Get:1 http://archive.ubuntu.com/ubuntu 
xenial/restricted amd64 iucode-tool amd64 1.5-1 [34.0 kB]
Feb  4 18:07:22 lubuntu ubiquity: Get:2 http://archive.ubuntu.com/ubuntu 
xenial/restricted amd64 intel-microcode amd64 3.20151106.1 [464 kB]
Feb  4 18:07:23 lubuntu ubiquity: debconf: unable to initialize frontend: Dialog
Feb  4 18:07:23 lubuntu ubiquity: debconf: (TERM is not set, so the dialog 
frontend is not usable.)
Feb  4 18:07:23 lubuntu ubiquity: debconf: falling back to frontend: Readline
Feb  4 18:07:25 lubuntu ubiquity: debconf: unable to initialize frontend: 
Readline
Feb  4 18:07:25 lubuntu ubiquity: debconf: (This frontend requires a 
controlling tty.)
Feb  4 18:07:25 lubuntu ubiquity: debconf: falling back to frontend: Teletype
Feb  4 18:07:25 lubuntu ubiquity: dpkg-preconfigure: unable to re-open stdin:
Feb  4 18:07:25 lubuntu ubiquity: Fetched 498 kB in 0s (499 kB/s)
Feb  4 18:07:25 lubuntu ubiquity: Selecting previously unselected package 
iucode-tool.
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ...
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 5%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 10%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 15%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 20%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 25%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 30%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 35%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 40%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 45%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 50%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 55%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 60%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 65%#015(Reading 
database ... 70%#015(Reading database ... 75%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 80%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 85%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 90%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 95%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ... 100%
Feb  4 18:07:25 lubuntu ubiquity: (Reading database ...
Feb  4 18:07:25 lubuntu ubiquity: 118532 files and directories currently 
installed.)
Feb  4 18:07:25 lubuntu ubiquity: Preparing to unpack 
.../iucode-tool_1.5-1_amd64.deb ...
Feb  4 18:07:25 lubuntu ubiquity: Unpacking iucode-tool (1.5-1) ...
Feb  4 18:07:25 lubuntu ubiquity: Selecting previously unselected package 
intel-microcode.
Feb  4 18:07:25 lubuntu ubiquity: Preparing to unpack 
.../intel-microcode_3.20151106.1_amd64.deb ...
Feb  4 18:07:25 lubuntu ubiquity: Unpacking intel-microcode (3.20151106.1) ...
Feb  4 18:07:25 lubuntu NetworkManager[1971]: <info>  kernel firmware directory 
'/lib/firmware' changed
Feb  4 18:07:26 lubuntu ubiquity: Processing triggers for man-db (2.7.5-1) ...
Feb  4 18:07:26 lubuntu ubiquity: Setting up iucode-tool (1.5-1) ...
Feb  4 18:07:26 lubuntu ubiquity: Setting up intel-microcode (3.20151106.1) ...
Feb  4 18:07:26 lubuntu ubiquity: update-initramfs is disabled since running on 
read-only media
Feb  4 18:07:26 lubuntu ubiquity: intel-microcode: microcode will be updated at 
next boot
Feb  4 18:07:26 lubuntu ubiquity[19194]: debconffilter_done: ubi-prepare 
(current: ubi-prepare)
Feb  4 18:07:26 lubuntu ubiquity[19194]: Step_before = stepPrepare
Feb  4 18:07:26 lubuntu activate-dmraid: No Serial ATA RAID disks detected
Feb  4 18:07:26 lubuntu partman:   No matching physical volumes found
Feb  4 18:07:26 lubuntu partman:   Reading all physical volumes.  This may take 
a while...
Feb  4 18:07:26 lubuntu kernel: [  918.609655]  sda: sda1 sda2 sda3
Feb  4 18:07:27 lubuntu ubiquity: NTFS signature is missing.
Feb  4 18:07:27 lubuntu ubiquity: Failed to mount '/dev/sda3'
Feb  4 18:07:27 lubuntu ubiquity: : Invalid argument
Feb  4 18:07:27 lubuntu ubiquity: The device '/dev/sda3' doesn't seem to have a 
valid NTFS.
Feb  4 18:07:27 lubuntu ubiquity: Maybe the wrong device is used? Or the whole 
disk instead of a
Feb  4 18:07:27 lubuntu ubiquity: partition (e.g. /dev/sda, not /dev/sda1)? Or 
the other way around?
Feb  4 18:07:27 lubuntu ubiquity: NTFS signature is missing.
Feb  4 18:07:27 lubuntu ubiquity: Failed to mount '/dev/sda3'
Feb  4 18:07:27 lubuntu ubiquity: : Invalid argument
Feb  4 18:07:27 lubuntu ubiquity: The device '/dev/sda3' doesn't seem to have a 
valid NTFS.
Feb  4 18:07:27 lubuntu ubiquity: Maybe the wrong device is used? Or the whole 
disk instead of a
Feb  4 18:07:27 lubuntu ubiquity: partition (e.g. /dev/sda, not /dev/sda1)? Or 
the other way around?
Feb  4 18:07:28 lubuntu ubiquity: NTFS signature is missing.
Feb  4 18:07:28 lubuntu ubiquity: Failed to mount '/dev/sda3'
Feb  4 18:07:28 lubuntu ubiquity: : Invalid argument
Feb  4 18:07:28 lubuntu ubiquity: The device '/dev/sda3' doesn't seem to have a 
valid NTFS.
Feb  4 18:07:28 lubuntu ubiquity: Maybe the wrong device is used? Or the whole 
disk instead of a
Feb  4 18:07:28 lubuntu ubiquity: partition (e.g. /dev/sda, not /dev/sda1)? Or 
the other way around?
Feb  4 18:07:28 lubuntu ubiquity: NTFS signature is missing.
Feb  4 18:07:28 lubuntu ubiquity: Failed to mount '/dev/sda3'
Feb  4 18:07:28 lubuntu ubiquity: : Invalid argument
Feb  4 18:07:28 lubuntu ubiquity: The device '/dev/sda3' doesn't seem to have a 
valid NTFS.
Feb  4 18:07:28 lubuntu ubiquity: Maybe the wrong device is used? Or the whole 
disk instead of a
Feb  4 18:07:28 lubuntu ubiquity: partition (e.g. /dev/sda, not /dev/sda1)? Or 
the other way around?
Feb  4 18:07:28 lubuntu os-prober: debug: running 
/usr/lib/os-probes/50mounted-tests on /dev/sda1
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: mounted using GRUB fat 
filesystem driver
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/05efi
Feb  4 18:07:28 lubuntu 05efi: debug: /dev/sda1 is a FAT partition (mounted by 
GRUB)
Feb  4 18:07:28 lubuntu 05efi: debug: /dev/sda1 partition scheme is gpt
Feb  4 18:07:28 lubuntu 05efi: debug: /dev/sda1 partition type is 
c12a7328-f81f-11d2-ba4b-00a0c93ec93b
Feb  4 18:07:28 lubuntu 05efi: debug: /var/lib/os-prober/mount does not have 
/EFI directory: exiting
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/10freedos
Feb  4 18:07:28 lubuntu 10freedos: debug: /dev/sda1 is a FAT partition (mounted 
by GRUB)
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/10qnx
Feb  4 18:07:28 lubuntu 10qnx: debug: /dev/sda1 is not a QNX4 partition: exiting
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/20macosx
Feb  4 18:07:28 lubuntu macosx-prober: debug: /dev/sda1 is not an HFS+ 
partition: exiting
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/20microsoft
Feb  4 18:07:28 lubuntu 20microsoft: debug: Skipping legacy bootloaders on UEFI 
system
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/30utility
Feb  4 18:07:28 lubuntu 30utility: debug: /dev/sda1 is a FAT partition (mounted 
by GRUB)
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/40lsb
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/70hurd
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/80minix
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/83haiku
Feb  4 18:07:28 lubuntu 83haiku: debug: /dev/sda1 is not a BeFS partition: 
exiting
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/90linux-distro
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/90solaris
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/efi
Feb  4 18:07:28 lubuntu os-prober: debug: running 
/usr/lib/os-probes/50mounted-tests on /dev/sda2
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: mounted using GRUB ext2 
filesystem driver
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/05efi
Feb  4 18:07:28 lubuntu 05efi: debug: /dev/sda2 is ext2 partition: exiting
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/10freedos
Feb  4 18:07:28 lubuntu 10freedos: debug: /dev/sda2 is not a FAT partition: 
exiting
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/10qnx
Feb  4 18:07:28 lubuntu 10qnx: debug: /dev/sda2 is not a QNX4 partition: exiting
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/20macosx
Feb  4 18:07:28 lubuntu macosx-prober: debug: /dev/sda2 is not an HFS+ 
partition: exiting
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/20microsoft
Feb  4 18:07:28 lubuntu 20microsoft: debug: Skipping legacy bootloaders on UEFI 
system
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/30utility
Feb  4 18:07:28 lubuntu 30utility: debug: /dev/sda2 is not a FAT partition: 
exiting
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/40lsb
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/70hurd
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/80minix
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/83haiku
Feb  4 18:07:28 lubuntu 83haiku: debug: /dev/sda2 is not a BeFS partition: 
exiting
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/90linux-distro
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/90solaris
Feb  4 18:07:28 lubuntu 50mounted-tests: debug: running subtest 
/usr/lib/os-probes/mounted/efi
Feb  4 18:07:28 lubuntu os-prober: debug: running 
/usr/lib/os-probes/50mounted-tests on /dev/sda3
Feb  4 18:07:28 lubuntu kernel: [  920.589996] EXT4-fs (sda3): VFS: Can't find 
ext4 filesystem
Feb  4 18:07:28 lubuntu kernel: [  920.591263] EXT4-fs (sda3): VFS: Can't find 
ext4 filesystem
Feb  4 18:07:28 lubuntu kernel: [  920.592283] EXT4-fs (sda3): VFS: Can't find 
ext4 filesystem
Feb  4 18:07:28 lubuntu kernel: [  920.593256] FAT-fs (sda3): bogus number of 
reserved sectors
Feb  4 18:07:28 lubuntu kernel: [  920.593259] FAT-fs (sda3): Can't find a 
valid FAT filesystem
Feb  4 18:07:28 lubuntu kernel: [  920.599308] ISOFS: Unable to identify CD-ROM 
format.
Feb  4 18:07:28 lubuntu kernel: [  920.600681] squashfs: SQUASHFS error: Can't 
find a SQUASHFS superblock on sda3
Feb  4 18:07:28 lubuntu kernel: [  920.604546] XFS (sda3): Invalid superblock 
magic number
Feb  4 18:07:28 lubuntu kernel: [  920.605984] FAT-fs (sda3): bogus number of 
reserved sectors
Feb  4 18:07:28 lubuntu kernel: [  920.605987] FAT-fs (sda3): Can't find a 
valid FAT filesystem
Feb  4 18:07:28 lubuntu kernel: [  920.608810] VFS: Can't find a Minix 
filesystem V1 | V2 | V3 on device sda3.
Feb  4 18:07:28 lubuntu kernel: [  920.609809] hfsplus: unable to find HFS+ 
superblock
Feb  4 18:07:28 lubuntu kernel: [  920.610683] qnx4: no qnx4 filesystem (no 
root dir).
Feb  4 18:07:28 lubuntu kernel: [  920.611542] ufs: You didn't specify the type 
of your ufs filesystem
Feb  4 18:07:28 lubuntu kernel: [  920.611542] 
Feb  4 18:07:28 lubuntu kernel: [  920.611542] mount -t ufs -o 
ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
Feb  4 18:07:28 lubuntu kernel: [  920.611542] 
Feb  4 18:07:28 lubuntu kernel: [  920.611542] >>>WARNING<<< Wrong ufstype may 
corrupt your filesystem, default is ufstype=old
Feb  4 18:07:28 lubuntu kernel: [  920.611635] ufs: ufs_fill_super(): bad magic 
number
Feb  4 18:07:28 lubuntu kernel: [  920.612543] hfs: can't find a HFS filesystem 
on dev sda3
Feb  4 18:07:28 lubuntu ubiquity[19194]: Device free not found in os-prober 
output
Feb  4 18:07:28 lubuntu ubiquity[19194]: Device /dev/sda1 not found in 
os-prober output
Feb  4 18:07:28 lubuntu ubiquity[19194]: Device /dev/sda2 not found in 
os-prober output
Feb  4 18:07:28 lubuntu ubiquity[19194]: Device /dev/sda3 not found in 
os-prober output
Feb  4 18:07:28 lubuntu ubiquity[19194]: Device free not found in os-prober 
output
Feb  4 18:07:28 lubuntu ubiquity[19194]: switched to page partman
Feb  4 18:07:31 lubuntu ubiquity[19194]: switched to page partman
Feb  4 18:07:41 lubuntu ubiquity: /var/lib/partman/devices/=dev=sda
Feb  4 18:07:41 lubuntu kernel: [  933.826776]  sda: sda1 sda2 sda3
Feb  4 18:07:42 lubuntu kernel: [  934.253744]  sda: sda1 sda2 sda3
Feb  4 18:07:42 lubuntu partman: mke2fs 1.42.13 (17-May-2015)
Feb  4 18:07:43 lubuntu ubiquity[19194]: Reverting lockdown of the desktop 
environment.
Feb  4 18:07:43 lubuntu activate-dmraid: No Serial ATA RAID disks detected
Feb  4 18:07:44 lubuntu ubiquity[19194]: switched to page partman
Feb  4 18:07:44 lubuntu ubiquity[19194]: Traceback (most recent call last):
Feb  4 18:07:44 lubuntu ubiquity[19194]:   File 
"/usr/lib/ubiquity/ubiquity/misc.py", line 164, in grub_options
Feb  4 18:07:44 lubuntu ubiquity[19194]:     for disk in p.disks():
Feb  4 18:07:44 lubuntu ubiquity[19194]:   File 
"/usr/lib/ubiquity/ubiquity/parted_server.py", line 161, in disks
Feb  4 18:07:44 lubuntu ubiquity[19194]:     return sorted(os.listdir(devices))
Feb  4 18:07:44 lubuntu ubiquity[19194]: FileNotFoundError: [Errno 2] No such 
file or directory: '/var/lib/partman/devices'
Feb  4 18:07:44 lubuntu ubiquity[19194]: 
Feb  4 18:07:44 lubuntu ubiquity[19194]: Traceback (most recent call last):
Feb  4 18:07:44 lubuntu ubiquity[19194]:   File 
"/usr/lib/ubiquity/ubiquity/misc.py", line 205, in boot_device
Feb  4 18:07:44 lubuntu ubiquity[19194]:     for disk in p.disks():
Feb  4 18:07:44 lubuntu ubiquity[19194]:   File 
"/usr/lib/ubiquity/ubiquity/parted_server.py", line 161, in disks
Feb  4 18:07:44 lubuntu ubiquity[19194]:     return sorted(os.listdir(devices))
Feb  4 18:07:44 lubuntu ubiquity[19194]: FileNotFoundError: [Errno 2] No such 
file or directory: '/var/lib/partman/devices'
Feb  4 18:07:44 lubuntu ubiquity[19194]: 
Feb  4 18:07:44 lubuntu ubiquity[19194]: Traceback (most recent call last):
Feb  4 18:07:44 lubuntu ubiquity[19194]:   File 
"/usr/lib/ubiquity/ubiquity/misc.py", line 164, in grub_options
Feb  4 18:07:44 lubuntu ubiquity[19194]:     for disk in p.disks():
Feb  4 18:07:44 lubuntu ubiquity[19194]:   File 
"/usr/lib/ubiquity/ubiquity/parted_server.py", line 161, in disks
Feb  4 18:07:44 lubuntu ubiquity[19194]:     return sorted(os.listdir(devices))
Feb  4 18:07:44 lubuntu ubiquity[19194]: FileNotFoundError: [Errno 2] No such 
file or directory: '/var/lib/partman/devices'
Feb  4 18:07:44 lubuntu ubiquity[19194]: 
Feb  4 18:07:44 lubuntu ubiquity[19194]: switched to page partman
Feb  4 18:07:44 lubuntu partman:   No matching physical volumes found
Feb  4 18:07:44 lubuntu partman:   Reading all physical volumes.  This may take 
a while...
Feb  4 18:07:46 lubuntu ubiquity: NTFS signature is missing.
Feb  4 18:07:46 lubuntu ubiquity: Failed to mount '/dev/sda3'
Feb  4 18:07:46 lubuntu ubiquity: : Invalid argument
Feb  4 18:07:46 lubuntu ubiquity: The device '/dev/sda3' doesn't seem to have a 
valid NTFS.
Feb  4 18:07:46 lubuntu ubiquity: Maybe the wrong device is used? Or the whole 
disk instead of a
Feb  4 18:07:46 lubuntu ubiquity: partition (e.g. /dev/sda, not /dev/sda1)? Or 
the other way around?
Feb  4 18:07:46 lubuntu ubiquity: NTFS signature is missing.
Feb  4 18:07:46 lubuntu ubiquity: Failed to mount '/dev/sda3'
Feb  4 18:07:46 lubuntu ubiquity: : Invalid argument
Feb  4 18:07:46 lubuntu ubiquity: The device '/dev/sda3' doesn't seem to have a 
valid NTFS.
Feb  4 18:07:46 lubuntu ubiquity: Maybe the wrong device is used? Or the whole 
disk instead of a
Feb  4 18:07:46 lubuntu ubiquity: partition (e.g. /dev/sda, not /dev/sda1)? Or 
the other way around?
Feb  4 18:07:46 lubuntu ubiquity: NTFS signature is missing.
Feb  4 18:07:46 lubuntu ubiquity: Failed to mount '/dev/sda3'
Feb  4 18:07:46 lubuntu ubiquity: : Invalid argument
Feb  4 18:07:46 lubuntu ubiquity: The device '/dev/sda3' doesn't seem to have a 
valid NTFS.
Feb  4 18:07:46 lubuntu ubiquity: Maybe the wrong device is used? Or the whole 
disk instead of a
Feb  4 18:07:46 lubuntu ubiquity: partition (e.g. /dev/sda, not /dev/sda1)? Or 
the other way around?
Feb  4 18:07:46 lubuntu ubiquity: NTFS signature is missing.
Feb  4 18:07:46 lubuntu ubiquity: Failed to mount '/dev/sda3'
Feb  4 18:07:46 lubuntu ubiquity: : Invalid argument
Feb  4 18:07:46 lubuntu ubiquity: The device '/dev/sda3' doesn't seem to have a 
valid NTFS.
Feb  4 18:07:46 lubuntu ubiquity: Maybe the wrong device is used? Or the whole 
disk instead of a
Feb  4 18:07:46 lubuntu ubiquity: partition (e.g. /dev/sda, not /dev/sda1)? Or 
the other way around?
Feb  4 18:07:47 lubuntu ubiquity[19194]: Device free not found in os-prober 
output
Feb  4 18:07:47 lubuntu ubiquity[19194]: Device /dev/sda1 not found in 
os-prober output
Feb  4 18:07:47 lubuntu ubiquity[19194]: Device /dev/sda2 not found in 
os-prober output
Feb  4 18:07:47 lubuntu ubiquity[19194]: Device /dev/sda3 not found in 
os-prober output
Feb  4 18:07:47 lubuntu ubiquity[19194]: Device free not found in os-prober 
output
Feb  4 18:07:47 lubuntu ubiquity[19194]: switched to page partman
Feb  4 18:07:53 lubuntu ubiquity[19194]: debconffilter_done: ubi-partman 
(current: ubi-partman)
Feb  4 18:07:53 lubuntu ubiquity[19194]: debconffilter_done: ubi-partman 
(current: None)
Feb  4 18:07:53 lubuntu ubiquity[19194]: dbfilter_handle_status: 
('ubi-partman', 141)
Feb  4 18:07:55 lubuntu ubiquity[19194]: debconffilter_done: 
ubiquity.components.partman_commit (current: None)
Feb  4 18:07:55 lubuntu ubiquity: Traceback (most recent call last):
Feb  4 18:07:55 lubuntu ubiquity:   File "/usr/share/ubiquity/install.py", line 
751, in <module>
Feb  4 18:07:55 lubuntu ubiquity:     install = Install()
Feb  4 18:07:55 lubuntu ubiquity:   File "/usr/share/ubiquity/install.py", line 
72, in __init__
Feb  4 18:07:55 lubuntu ubiquity:     'Failed to mount the target: %s' % 
str(self.target)
Feb  4 18:07:55 lubuntu ubiquity: AssertionError: Failed to mount the target: 
/target
Feb  4 18:07:58 lubuntu ubiquity: Gtk-Message: Failed to load module 
"overlay-scrollbar"
Feb  4 18:07:58 lubuntu ubiquity: 
Feb  4 18:07:58 lubuntu ubiquity: ** (apport-gtk:26827): WARNING **: Error 
retrieving accessibility bus address: 
org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not 
provided by any .service files

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.43
ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
Uname: Linux 4.3.0-7-generic x86_64
ApportVersion: 2.19.3-0ubuntu3
Architecture: amd64
CasperVersion: 1.366
Date: Thu Feb  4 18:07:58 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/lubuntu.seed 
boot=casper quiet splash ---
LiveMediaBuild: Lubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160121)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lubuntu ubiquity-2.21.42 xenial

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https://bugs.launchpad.net/bugs/1542101

Title:
  Ubi part crashed on install

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