Public bug reported:

Issue occurs with Linux Mint as well...

/05efi on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate 05efi: debug: /dev/sdb1 is a FAT32 partition
May 20 06:19:14 ubuntu-mate 05efi: debug: /dev/sdb1 partition scheme is dos
May 20 06:19:14 ubuntu-mate 05efi: debug: /dev/sdb1 partition type is 0xc
May 20 06:19:14 ubuntu-mate 05efi: debug: /dev/sdb1 is not a ESP partition: 
exiting
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/10freedos on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate 10freedos: debug: /dev/sdb1 is a FAT32 partition
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/10qnx on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate 10qnx: debug: /dev/sdb1 is not a QNX4 partition: 
exiting
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/20macosx on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate macosx-prober: debug: /dev/sdb1 is not an HFS+ 
partition: exiting
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/20microsoft on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate 20microsoft: debug: Skipping legacy bootloaders on 
UEFI system
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/30utility on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate 30utility: debug: /dev/sdb1 is a FAT32 partition
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/40lsb on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/70hurd on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/80minix on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/83haiku on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate 83haiku: debug: /dev/sdb1 is not a BeFS partition: 
exiting
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/90linux-distro on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/90solaris on mounted /dev/sdb1
May 20 06:19:14 ubuntu-mate ubiquity[3720]: Device free not found in os-prober 
output
May 20 06:19:14 ubuntu-mate ubiquity[3720]: Device /dev/sda1 not found in 
os-prober output
May 20 06:19:14 ubuntu-mate ubiquity[3720]: Device free not found in os-prober 
output
May 20 06:19:14 ubuntu-mate ubiquity[3720]: switched to page partman
May 20 06:19:50 ubuntu-mate ubiquity[3720]: debconffilter_done: ubi-partman 
(current: ubi-partman)
May 20 06:19:50 ubuntu-mate ubiquity[3720]: Step_before = stepPartAsk
May 20 06:19:50 ubuntu-mate clock-setup: rdate called using NTP server 
ntp.ubuntu.com.
May 20 06:19:54 ubuntu-mate kernel: [ 7284.693144]  sda: sda1 sda2 sda3
May 20 06:19:55 ubuntu-mate partman: mkswap: /dev/sda3: warning: wiping old 
swap signature.
May 20 06:19:56 ubuntu-mate kernel: [ 7285.762418] Adding 3770364k swap on 
/dev/sda3.  Priority:-1 extents:1 across:3770364k FS
May 20 06:19:56 ubuntu-mate partman: mke2fs 1.42.13 (17-May-2015)
May 20 06:19:56 ubuntu-mate systemd[1523]: Time has been changed
May 20 06:19:56 ubuntu-mate systemd[1]: Time has been changed
May 20 06:19:56 ubuntu-mate systemd[1]: apt-daily.timer: Adding 4h 18min 
31.880581s random time.
May 20 06:19:56 ubuntu-mate clock-setup: Fri May 20 06:19:56 UTC 2016
May 20 06:19:56 ubuntu-mate clock-setup: rdate: adjust local clock by -0.005463 
seconds
May 20 06:19:59 ubuntu-mate ubiquity[3720]: switched to page timezone
May 20 06:20:01 ubuntu-mate kernel: [ 7291.597892] EXT4-fs (sda2): mounted 
filesystem with ordered data mode. Opts: errors=remount-ro
May 20 06:20:02 ubuntu-mate localechooser: info: debian-installer/language 
preseeded to 'en' (seen: false)
May 20 06:20:02 ubuntu-mate localechooser: info: debian-installer/country 
preseeded to 'US' (seen: true)
May 20 06:20:02 ubuntu-mate localechooser: info: debian-installer/locale 
preseeded to 'en_US.UTF-8' (seen: true)
May 20 06:20:02 ubuntu-mate localechooser: info: Language = 'en'
May 20 06:20:02 ubuntu-mate localechooser: info: 
line=en;0;US;en_US.UTF-8;;console-setup
May 20 06:20:02 ubuntu-mate localechooser: info: Set debian-installer/language 
= 'en'
May 20 06:20:02 ubuntu-mate localechooser: info: Default country = 'US'
May 20 06:20:02 ubuntu-mate localechooser: info: Default locale = 'en_US.UTF-8'
May 20 06:20:02 ubuntu-mate localechooser: info: Set 
debian-installer/consoledisplay = 'console-setup'
May 20 06:20:02 ubuntu-mate localechooser: info: Set debian-installer/country = 
'US'
May 20 06:20:02 ubuntu-mate localechooser: info: Set debian-installer/locale = 
'en_US.UTF-8'
May 20 06:20:03 ubuntu-mate localechooser: info: System locale 
(debian-installer/locale) = 'en_US.UTF-8'
May 20 06:20:03 ubuntu-mate os-prober: File descriptor 3 (pipe:[136392]) leaked 
on lvs invocation.
May 20 06:20:03 ubuntu-mate os-prober:  Parent PID 9741: log-output
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/05efi on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate 05efi: debug: /dev/sda1 is a FAT32 partition
May 20 06:20:03 ubuntu-mate 05efi: debug: /dev/sda1 partition scheme is gpt
May 20 06:20:03 ubuntu-mate 05efi: debug: /dev/sda1 partition type is 
c12a7328-f81f-11d2-ba4b-00a0c93ec93b
May 20 06:20:03 ubuntu-mate 05efi: debug: /target/boot/efi does not have /EFI 
directory: exiting
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/10freedos on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate 10freedos: debug: /dev/sda1 is a FAT32 partition
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/10qnx on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate 10qnx: debug: /dev/sda1 is not a QNX4 partition: 
exiting
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/20macosx on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate macosx-prober: debug: /dev/sda1 is not an HFS+ 
partition: exiting
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/20microsoft on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate 20microsoft: debug: Skipping legacy bootloaders on 
UEFI system
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/30utility on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate 30utility: debug: /dev/sda1 is a FAT32 partition
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/40lsb on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/70hurd on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/80minix on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/83haiku on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate 83haiku: debug: /dev/sda1 is not a BeFS partition: 
exiting
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/90linux-distro on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/90solaris on mounted /dev/sda1
May 20 06:20:03 ubuntu-mate os-prober: debug: /dev/sda3: is active swap
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/05efi on mounted /dev/sdb1
May 20 06:20:03 ubuntu-mate 05efi: debug: /dev/sdb1 is a FAT32 partition
May 20 06:20:03 ubuntu-mate 05efi: debug: /dev/sdb1 partition scheme is dos
May 20 06:20:03 ubuntu-mate 05efi: debug: /dev/sdb1 partition type is 0xc
May 20 06:20:03 ubuntu-mate 05efi: debug: /dev/sdb1 is not a ESP partition: 
exiting
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/10freedos on mounted /dev/sdb1
May 20 06:20:03 ubuntu-mate 10freedos: debug: /dev/sdb1 is a FAT32 partition
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/10qnx on mounted /dev/sdb1
May 20 06:20:03 ubuntu-mate ubiquity[3720]: debconffilter_done: 
ubiquity.components.partman_commit (current: ubi-timezone)
May 20 06:20:03 ubuntu-mate 10qnx: debug: /dev/sdb1 is not a QNX4 partition: 
exiting
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/20macosx on mounted /dev/sdb1
May 20 06:20:03 ubuntu-mate macosx-prober: debug: /dev/sdb1 is not an HFS+ 
partition: exiting
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/20microsoft on mounted /dev/sdb1
May 20 06:20:03 ubuntu-mate 20microsoft: debug: Skipping legacy bootloaders on 
UEFI system
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/30utility on mounted /dev/sdb1
May 20 06:20:03 ubuntu-mate 30utility: debug: /dev/sdb1 is a FAT32 partition
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/40lsb on mounted /dev/sdb1
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/70hurd on mounted /dev/sdb1
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/80minix on mounted /dev/sdb1
May 20 06:20:03 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/83haiku on mounted /dev/sdb1
May 20 06:20:03 ubuntu-mate 83haiku: debug: /dev/sdb1 is not a BeFS partition: 
exiting
May 20 06:20:04 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/90linux-distro on mounted /dev/sdb1
May 20 06:20:04 ubuntu-mate os-prober: debug: running 
/usr/lib/os-probes/mounted/90solaris on mounted /dev/sdb1
May 20 06:20:04 ubuntu-mate ubiquity[3720]: debconffilter_done: ubi-timezone 
(current: ubi-timezone)
May 20 06:20:04 ubuntu-mate ubiquity[3720]: Step_before = stepLocation
May 20 06:20:04 ubuntu-mate /install.py: keeping packages due to preseeding:
May 20 06:20:04 ubuntu-mate /install.py: keeping language packs for: en_US.UTF-8
May 20 06:20:06 ubuntu-mate ubiquity[3720]: switched to page console_setup
May 20 06:20:07 ubuntu-mate ubiquity[3720]: log-output -t ubiquity setxkbmap 
-model pc105 -layout us -option
May 20 06:20:15 ubuntu-mate ubiquity: Your console font configuration will be 
updated the next time your system
May 20 06:20:15 ubuntu-mate ubiquity: boots. If you want to update it now, run 
'setupcon' from a virtual console.
May 20 06:20:15 ubuntu-mate ubiquity[3720]: log-output -t ubiquity setxkbmap 
-model pc105 -layout us -option
May 20 06:20:15 ubuntu-mate ubiquity[3720]: debconffilter_done: 
ubi-console-setup (current: ubi-console-setup)
May 20 06:20:15 ubuntu-mate ubiquity[3720]: Step_before = stepKeyboardConf
May 20 06:20:15 ubuntu-mate ubiquity[3720]: switched to page usersetup
May 20 06:20:53 ubuntu-mate ubiquity[3720]: debconffilter_done: ubi-usersetup 
(current: ubi-usersetup)
May 20 06:20:53 ubuntu-mate ubiquity[3720]: Step_before = stepUserInfo
May 20 06:21:16 ubuntu-mate ubiquity: W
May 20 06:21:16 ubuntu-mate ubiquity: :
May 20 06:21:16 ubuntu-mate ubiquity: The repository 'cdrom://Ubuntu-MATE 16.04 
LTS _Xenial Xerus_ - Release amd64 (20160420.1) trusty Release' does not have a 
Release file.
May 20 06:21:16 ubuntu-mate ubiquity: 
May 20 06:21:16 ubuntu-mate ubiquity: E
May 20 06:21:16 ubuntu-mate ubiquity: :
May 20 06:21:16 ubuntu-mate ubiquity: Failed to fetch 
store:/var/lib/apt/lists/partial/Ubuntu-MATE%2016.04%20LTS%20%5fXenial%20Xerus%5f%20-%20Release%20amd64%20(20160420.1)_dists_trusty_restricted_binary-amd64_Packages
  Empty files can't be valid archives
May 20 06:21:16 ubuntu-mate ubiquity: 
May 20 06:21:16 ubuntu-mate ubiquity: E
May 20 06:21:16 ubuntu-mate ubiquity: :
May 20 06:21:16 ubuntu-mate ubiquity: Some index files failed to download. They 
have been ignored, or old ones used instead.
May 20 06:21:16 ubuntu-mate ubiquity: 
May 20 06:22:44 ubuntu-mate ntpd[1682]: kernel reports TIME_ERROR: 0x41: Clock 
Unsynchronized
May 20 06:25:02 ubuntu-mate CRON[10730]: (root) CMD (test -x /usr/sbin/anacron 
|| ( cd / && run-parts --report /etc/cron.daily ))
May 20 06:25:16 ubuntu-mate /install.py: Terminated ubiquity update process.
May 20 06:25:17 ubuntu-mate ubiquity[3720]: debconffilter_done: 
ubiquity.components.install (current: None)
May 20 06:25:31 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target python2.7 /usr/lib/python2.7/py_compile.py
May 20 06:25:31 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target python2.7 /usr/lib/python2.7/py_compile.py
May 20 06:25:31 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target python3.5 /usr/lib/python3.5/py_compile.py
May 20 06:25:32 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target python3.5 /usr/lib/python3.5/py_compile.py
May 20 06:25:32 ubuntu-mate ubiquity: Listing /usr/share/python/ ...
May 20 06:25:32 ubuntu-mate ubiquity: Listing /usr/share/python/debpython ...
May 20 06:25:32 ubuntu-mate ubiquity: Compiling 
/usr/share/python/debpython/__init__.py ...
May 20 06:25:32 ubuntu-mate ubiquity: Compiling 
/usr/share/python/debpython/debhelper.py ...
May 20 06:25:32 ubuntu-mate ubiquity: Compiling 
/usr/share/python/debpython/depends.py ...
May 20 06:25:32 ubuntu-mate ubiquity: Compiling 
/usr/share/python/debpython/files.py ...
May 20 06:25:32 ubuntu-mate ubiquity: Compiling 
/usr/share/python/debpython/namespace.py ...
May 20 06:25:32 ubuntu-mate ubiquity: Compiling 
/usr/share/python/debpython/option.py ...
May 20 06:25:32 ubuntu-mate ubiquity: Compiling 
/usr/share/python/debpython/pydist.py ...
May 20 06:25:32 ubuntu-mate ubiquity: Compiling 
/usr/share/python/debpython/tools.py ...
May 20 06:25:32 ubuntu-mate ubiquity: Compiling 
/usr/share/python/debpython/version.py ...
May 20 06:25:32 ubuntu-mate ubiquity: Listing /usr/share/python/dist ...
May 20 06:25:32 ubuntu-mate ubiquity: Listing /usr/share/python/ns ...
May 20 06:25:32 ubuntu-mate ubiquity: Compiling /usr/share/python/pyversions.py 
...
May 20 06:25:32 ubuntu-mate ubiquity: Listing /usr/share/python/runtime.d ...
May 20 06:25:32 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target python2.7 -m compileall /usr/share/python/
May 20 06:25:33 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target py3compile -p python3 /usr/share/python3/
May 20 06:25:34 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target mount -t proc proc /proc
May 20 06:25:34 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target mount -t sysfs sysfs /sys
May 20 06:25:34 ubuntu-mate /plugininstall.py: log-output -t ubiquity mount 
--bind /dev /target/dev
May 20 06:25:34 ubuntu-mate /plugininstall.py: log-output -t ubiquity mount 
--bind /run /target/run
May 20 06:25:42 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/public_modules.rtinstall rtinstall 
python2.7  2.7.11-7ubuntu1
May 20 06:25:42 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/gufw.rtupdate pre-rtupdate python2.7 
python2.7
May 20 06:25:42 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/apport.rtupdate pre-rtupdate python2.7 
python2.7
May 20 06:25:42 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/mate-menu.rtupdate pre-rtupdate python2.7 
python2.7
May 20 06:25:42 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/mate-menus.rtupdate pre-rtupdate python2.7 
python2.7
May 20 06:25:43 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/gufw.rtupdate rtupdate python2.7 python2.7
May 20 06:25:43 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/apport.rtupdate rtupdate python2.7 python2.7
May 20 06:25:45 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/mate-menu.rtupdate rtupdate python2.7 
python2.7
May 20 06:25:45 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/mate-menus.rtupdate rtupdate python2.7 
python2.7
May 20 06:25:45 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/gufw.rtupdate post-rtupdate python2.7 
python2.7
May 20 06:25:45 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/apport.rtupdate post-rtupdate python2.7 
python2.7
May 20 06:25:45 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/mate-menu.rtupdate post-rtupdate python2.7 
python2.7
May 20 06:25:45 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python/runtime.d/mate-menus.rtupdate post-rtupdate python2.7 
python2.7
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/public_modules.rtinstall rtinstall 
python3.5  3.5.1-10
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/rhythmbox-plugins.rtupdate pre-rtupdate 
python3.5 python3.5
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/ubuntu-drivers-common.rtupdate 
pre-rtupdate python3.5 python3.5
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/ubiquity.rtupdate pre-rtupdate python3.5 
python3.5
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/ubiquity-frontend-gtk.rtupdate 
pre-rtupdate python3.5 python3.5
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/gdebi.rtupdate pre-rtupdate python3.5 
python3.5
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/hplip-data.rtupdate pre-rtupdate python3.5 
python3.5
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/onboard.rtupdate pre-rtupdate python3.5 
python3.5
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/dh-python.rtupdate pre-rtupdate python3.5 
python3.5
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/rhythmbox.rtupdate pre-rtupdate python3.5 
python3.5
May 20 06:26:09 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/gdebi-core.rtupdate pre-rtupdate python3.5 
python3.5
May 20 06:26:11 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/rhythmbox-plugins.rtupdate rtupdate 
python3.5 python3.5
May 20 06:26:12 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/ubuntu-drivers-common.rtupdate rtupdate 
python3.5 python3.5
May 20 06:26:14 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/ubiquity.rtupdate rtupdate python3.5 
python3.5
May 20 06:26:15 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/ubiquity-frontend-gtk.rtupdate rtupdate 
python3.5 python3.5
May 20 06:26:17 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/gdebi.rtupdate rtupdate python3.5 python3.5
May 20 06:26:20 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/hplip-data.rtupdate rtupdate python3.5 
python3.5
May 20 06:26:21 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/onboard.rtupdate rtupdate python3.5 
python3.5
May 20 06:26:23 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/dh-python.rtupdate rtupdate python3.5 
python3.5
May 20 06:26:24 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/rhythmbox.rtupdate rtupdate python3.5 
python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/gdebi-core.rtupdate rtupdate python3.5 
python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/rhythmbox-plugins.rtupdate post-rtupdate 
python3.5 python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/ubuntu-drivers-common.rtupdate 
post-rtupdate python3.5 python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/ubiquity.rtupdate post-rtupdate python3.5 
python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/ubiquity-frontend-gtk.rtupdate 
post-rtupdate python3.5 python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/gdebi.rtupdate post-rtupdate python3.5 
python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/hplip-data.rtupdate post-rtupdate 
python3.5 python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/onboard.rtupdate post-rtupdate python3.5 
python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/dh-python.rtupdate post-rtupdate python3.5 
python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/rhythmbox.rtupdate post-rtupdate python3.5 
python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target /usr/share/python3/runtime.d/gdebi-core.rtupdate post-rtupdate 
python3.5 python3.5
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target umount /sys
May 20 06:26:25 ubuntu-mate /plugininstall.py: log-output -t ubiquity chroot 
/target umount /proc
May 20 06:26:26 ubuntu-mate /plugininstall.py: log-output -t ubiquity umount 
/target/run
May 20 06:26:26 ubuntu-mate /plugininstall.py: log-output -t ubiquity umount 
/target/dev
May 20 06:26:26 ubuntu-mate localechooser: Generating locales (this might take 
a while)...
May 20 06:26:26 ubuntu-mate localechooser: Generation complete.
May 20 06:26:27 ubuntu-mate ubiquity: umount: /target/cdrom: mountpoint not 
found
May 20 06:26:27 ubuntu-mate /plugininstall.py: log-output -t ubiquity umount 
/target/cdrom
May 20 06:26:27 ubuntu-mate /plugininstall.py: log-output -t ubiquity mount 
--bind /cdrom /target/cdrom
May 20 06:26:27 ubuntu-mate ubiquity: 
/usr/lib/ubiquity/apt-setup/generators/01setup: 9: 
/usr/lib/ubiquity/apt-setup/generators/01setup:
May 20 06:26:27 ubuntu-mate ubiquity: cannot open /target/etc/apt/sources.list: 
No such file
May 20 06:26:27 ubuntu-mate ubiquity: 
May 20 06:26:32 ubuntu-mate in-target: Reading package lists...
May 20 06:26:33 ubuntu-mate in-target: 
May 20 06:26:33 ubuntu-mate apt-setup: Using CD-ROM mount point /cdrom/
May 20 06:26:33 ubuntu-mate apt-setup: Identifying...
May 20 06:26:33 ubuntu-mate apt-setup: [e44f2f6e5396af20cdbfdcce415c00e0-2]
May 20 06:26:33 ubuntu-mate apt-setup: Scanning disc for index files...
May 20 06:26:39 ubuntu-mate apt-setup: Found 19 package indexes, 0 source 
indexes, 0 translation indexes and 2 signatures
May 20 06:26:39 ubuntu-mate apt-setup: Found label 'Ubuntu-MATE 16.04 LTS 
_Xenial Xerus_ - Release amd64 (20160420.1)'
May 20 06:26:39 ubuntu-mate apt-setup: This disc is called:
May 20 06:26:39 ubuntu-mate apt-setup: 'Ubuntu-MATE 16.04 LTS _Xenial Xerus_ - 
Release amd64 (20160420.1)'
May 20 06:26:39 ubuntu-mate apt-setup: Copying package lists...
May 20 06:26:39 ubuntu-mate apt-setup: gpgv: Signature made Tue 22 Jul 2014 
02:12:37 PM HST using DSA key ID FBB75451
May 20 06:26:39 ubuntu-mate apt-setup: gpgv: BAD signature from "Ubuntu CD 
Image Automatic Signing Key <[email protected]>"
May 20 06:26:40 ubuntu-mate apt-setup: gpgv: Signature made Wed 20 Apr 2016 
01:17:55 PM HST using DSA key ID FBB75451
May 20 06:26:40 ubuntu-mate apt-setup: gpgv: Good signature from "Ubuntu CD 
Image Automatic Signing Key <[email protected]>"
May 20 06:26:40 ubuntu-mate apt-setup: #015Reading Package Indexes... 0%
May 20 06:26:40 ubuntu-mate apt-setup: #015Reading Package Indexes... 1%
May 20 06:26:40 ubuntu-mate apt-setup: #015Reading Package Indexes... Error!
May 20 06:26:40 ubuntu-mate apt-setup: Writing new source list
May 20 06:26:40 ubuntu-mate apt-setup: Source list entries for this disc are:
May 20 06:26:40 ubuntu-mate apt-setup: deb cdrom:[Ubuntu-MATE 16.04 LTS _Xenial 
Xerus_ - Release amd64 (20160420.1)]/ jessie main
May 20 06:26:40 ubuntu-mate apt-setup: deb cdrom:[Ubuntu-MATE 16.04 LTS _Xenial 
Xerus_ - Release amd64 (20160420.1)]/ trusty contrib main multiverse non-free 
restricted universe
May 20 06:26:40 ubuntu-mate apt-setup: deb cdrom:[Ubuntu-MATE 16.04 LTS _Xenial 
Xerus_ - Release amd64 (20160420.1)]/ xenial main multiverse restricted universe
May 20 06:26:40 ubuntu-mate apt-setup: Repeat this process for the rest of the 
CDs in your set.
May 20 06:26:40 ubuntu-mate apt-setup: E: Sub-process gpgv returned an error 
code (1)
May 20 06:26:40 ubuntu-mate apt-setup: W: Signature verification failed for: 
/cdrom/dists/trusty/Release.gpg
May 20 06:27:10 ubuntu-mate ubiquity[3720]: Reverting lockdown of the desktop 
environment.
May 20 06:27:10 ubuntu-mate activate-dmraid: No Serial ATA RAID disks detected
May 20 06:27:11 ubuntu-mate apt-setup: warning: 
/usr/lib/ubiquity/apt-setup/generators/40cdrom returned error code 1; 
discarding output
May 20 06:27:11 ubuntu-mate choose-mirror[11591]: INFO: base system installable 
from CD; skipping mirror check
May 20 06:27:11 ubuntu-mate choose-mirror[11591]: INFO: base system installable 
from CD; skipping architecture check
May 20 06:27:11 ubuntu-mate ubiquity: 
/usr/lib/ubiquity/apt-setup/generators/50mirror.ubuntu: 143: 
/usr/lib/ubiquity/apt-setup/generators/50mirror.ubuntu: cannot create 
/target/tmp/fileZahawp: Directory nonexistent
May 20 06:27:11 ubuntu-mate apt-setup: warning: 
/usr/lib/ubiquity/apt-setup/generators/50mirror.ubuntu returned error code 2; 
discarding output
May 20 06:27:11 ubuntu-mate ubiquity: chroot:
May 20 06:27:11 ubuntu-mate ubiquity: failed to run command ‘tempfile’
May 20 06:27:11 ubuntu-mate ubiquity: : No such file or directory
May 20 06:27:11 ubuntu-mate ubiquity: 
May 20 06:27:11 ubuntu-mate ubiquity: umount:
May 20 06:27:11 ubuntu-mate ubiquity: /target/cdrom: mountpoint not found
May 20 06:27:11 ubuntu-mate ubiquity: 
May 20 06:27:11 ubuntu-mate /plugininstall.py: log-output -t ubiquity umount 
/target/cdrom
May 20 06:27:11 ubuntu-mate ubiquity: grep:
May 20 06:27:11 ubuntu-mate ubiquity: /target/etc/apt/sources.list
May 20 06:27:11 ubuntu-mate ubiquity: : No such file or directory
May 20 06:27:11 ubuntu-mate ubiquity: 
May 20 06:27:11 ubuntu-mate /plugininstall.py: Exception during installation:
May 20 06:27:11 ubuntu-mate /plugininstall.py: Traceback (most recent call 
last):
May 20 06:27:11 ubuntu-mate /plugininstall.py:   File 
"/usr/share/ubiquity/plugininstall.py", line 1778, in <module>
May 20 06:27:11 ubuntu-mate /plugininstall.py:     install.run()
May 20 06:27:11 ubuntu-mate /plugininstall.py:   File 
"/usr/share/ubiquity/plugininstall.py", line 78, in wrapper
May 20 06:27:11 ubuntu-mate /plugininstall.py:     func(self)
May 20 06:27:11 ubuntu-mate /plugininstall.py:   File 
"/usr/share/ubiquity/plugininstall.py", line 202, in run
May 20 06:27:11 ubuntu-mate /plugininstall.py:     self.configure_apt()
May 20 06:27:11 ubuntu-mate /plugininstall.py:   File 
"/usr/share/ubiquity/plugininstall.py", line 655, in configure_apt
May 20 06:27:11 ubuntu-mate /plugininstall.py:     "AptSetup failed with code 
%d" % ret)
May 20 06:27:11 ubuntu-mate /plugininstall.py: 
ubiquity.install_misc.InstallStepError: AptSetup failed with code 127
May 20 06:27:11 ubuntu-mate /plugininstall.py: 
May 20 06:27:12 ubuntu-mate partman:   No matching physical volumes found
May 20 06:27:12 ubuntu-mate partman:   Reading all physical volumes.  This may 
take a while...
May 20 06:27:17 ubuntu-mate ubiquity: Gtk-Message: Failed to load module 
"overlay-scrollbar"
May 20 06:28:10 ubuntu-mate ubiquity: /usr/share/apport/apport-gtk:16: 
PyGIWarning: Wnck was imported without specifying a version first. Use 
gi.require_version('Wnck', '3.0') before import to ensure that the right 
version gets loaded.
May 20 06:28:10 ubuntu-mate ubiquity:   from gi.repository import GLib, Wnck, 
GdkX11, Gdk
May 20 06:28:10 ubuntu-mate ubiquity[3720]: log-output -t ubiquity apport-bug 
ubiquity
May 20 06:28:10 ubuntu-mate ubiquity[3720]: Reverting lockdown of the desktop 
environment.
May 20 06:28:11 ubuntu-mate ubiquity[3720]: Reverting lockdown of the desktop 
environment.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CasperVersion: 1.376
Date: Thu May 19 20:27:18 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi 
file=/cdrom/preseed/ubuntu-mate.seed cdrom-detect/try-usb=true noprompt 
floppy.allowed_drive_mask=0 ignore_uuid boot=casper quiet splash ---
LiveMediaBuild: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
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 ubiquity-2.21.63 ubuntu-mate xenial

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https://bugs.launchpad.net/bugs/1583913

Title:
  Can't install any ubuntu 16.04 flavor from USB - always looking for
  CD-ROM - even after fixing that it crashes...

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