mkusb не удалось смонтировать раздел во время постоянного создания USB. Что случилось?

Я пытаюсь создать живую постоянную загрузочную флешку. Я не могу понять, что не так, и это не работает. Терминал вне mkusb выглядит следующим образом:

start [mkusb 11.0.5] @ 2017-01-01 11:49:37 AM
---------------------------------------------------------------------------
Current directory=/home/gediz
main: usbonly=true
main: liveonly=true
No input file specified yet
main: source=''
TERM=xterm
ubuntu
---------------------------------------------------------------------------
menu_shell:
imagefile=/mnt/hgfs/ACTIVE_SOFTWARE/Other OS/ubuntu-16.04.1-desktop-amd64.iso
The iso file SHOULD BE loop mounted on a temporary file READ-ONLY:
mount: /dev/loop0 is write-protected, mounting read-only
disk_name_type=desktop
Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 _found_ in iso-file
Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 _not_ in any possible target drive
Booted from: /dev/sda
ans=u
ans=
---------------------------------------------------------------------------
menu_shell:
---------------------------------------------------------------------------
menu_shell:
imagefile=/mnt/hgfs/ACTIVE_SOFTWARE/Other OS/ubuntu-16.04.1-desktop-amd64.iso
Booted from: /dev/sda
ans=1
***** tu=/dev/sdb ****************************************************
selected target partition table: 'msdos'
mount: /dev/loop0 is write-protected, mounting read-only
 Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
---------------------------------------------------------------------------
chk4ubuntu_upgrades: mkusb

can set the security upgrade action (the default action of the persistent
live system when security upgrades are available). This method works for
Ubuntu family operating systems and some 're-spins'. You are installing
Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64

This can change 'Download and install automatically' to 'Display immediately'
set security upgrade action to 'Display immediately'
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mount: /dev/loop0 is write-protected, mounting read-only
select_boot_system: [if installed, use] usb-pack_efi=false
'/mnt/hgfs/ACTIVE_SOFTWARE/Other OS/ubuntu-16.04.1-desktop-amd64.iso' is identified as the source ISO file
<pre>
MODEL            NAME   FSTYPE LABEL      MOUNTPOINT  SIZE
Cruzer Glide 3.0 sdb                                 29.8G
                 ├─sdb1 ntfs   usbdata               22.6G
                 ├─sdb2 vfat                            1M
                 ├─sdb3 vfat   ubu1604164             122M
                 ├─sdb4                               1.4G
                 └─sdb5 ext4   casper-rw              5.7G
</pre>
Using the file '/usr/share/mkusb/grub.cfg'
Clean for a GUID partition table
GPT fdisk (gdisk) version 0.8.10

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): This option deletes all partitions and creates a new protective MBR.
Proceed? (Y/N): 
Command (? for help): 
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): OK; writing new GUID partition table (GPT) to /dev/sdb.
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot.
The operation has completed successfully.
Wipe the first megabyte (mibibyte) to get a clean boot area
1024+0 records in
1024+0 records out
1048576 bytes (1.0 MB) copied, 1.49029 s, 704 kB/s
lsblk: /dev/mmcblk?: not a block device
---------------------------------------------------------------------------
 Selected percentage of remaining space for persistence = 20 
---------------------------------------------------------------------------

lsblk: sdb3: failed to initialize sysfs handler
preparing /dev/sdb3  ------------------------------------------------
1024+0 records in
1024+0 records out
1048576 bytes (1.0 MB) copied, 0.97066 s, 1.1 MB/s
umount: /dev/sdb3: not mounted
mkfs.fat 3.0.27 (2014-11-12)
/dev/sdb3 has 64 heads and 32 sectors per track,
hidden sectors 0x1000;
logical sector size is 512,
using 0xf8 media descriptor, with 249856 sectors;
drive number 0x80;
filesystem has 2 32-bit FATs and 1 sector per cluster.
FAT size is 1922 sectors, and provides 245980 clusters.
There are 32 reserved sectors.
Volume ID is 1430fe73, no volume label.

preparing /dev/sdb1  ------------------------------------------------
1024+0 records in
1024+0 records out
1048576 bytes (1.0 MB) copied, 0.833496 s, 1.3 MB/s
umount: /dev/sdb1: not mounted
Cluster size has been automatically set to 4096 bytes.
Creating NTFS volume structures.
Creating root directory (mft record 5)
Creating $MFT (mft record 0)
Creating $MFTMirr (mft record 1)
Creating $LogFile (mft record 2)
Creating $AttrDef (mft record 4)
Creating $Bitmap (mft record 6)
Creating $Boot (mft record 7)
Creating backup boot sector.
Creating $Volume (mft record 3)
Creating $BadClus (mft record 8)
Creating $Secure (mft record 9)
Creating $UpCase (mft record 0xa)
Creating $Extend (mft record 11)
Creating system file (mft record 0xc)
Creating system file (mft record 0xd)
Creating system file (mft record 0xe)
Creating system file (mft record 0xf)
Creating $Quota (mft record 24)
Creating $ObjId (mft record 25)
Creating $Reparse (mft record 26)
Syncing root directory index record.
Syncing $Bitmap.
Syncing $MFT.
Updating $MFTMirr.
Syncing device.
mkntfs completed successfully. Have a nice day.
preparing /dev/sdb5  ------------------------------------------------
1024+0 records in
1024+0 records out
1048576 bytes (1.0 MB) copied, 0.922333 s, 1.1 MB/s
umount: /dev/sdb5: not mounted
mke2fs 1.42.12 (29-Aug-2014)
Creating filesystem with 1481472 4k blocks and 370944 inodes
Filesystem UUID: 9b06bf50-b1ff-4a60-956b-709ae2ac3b34
Superblock backups stored on blocks: 
    32768, 98304, 163840, 229376, 294912, 819200, 884736

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done 

mount: /mnt/hgfs/ACTIVE_SOFTWARE/Other OS/ubuntu-16.04.1-desktop-amd64.iso is already mounted
fatlabel: warning - lowercase labels might not work properly with DOS or Windows
tune2fs 1.42.12 (29-Aug-2014)
---------------------------------------------------------------------------
source=/mnt/hgfs/ACTIVE_SOFTWARE/Other OS/ubuntu-16.04.1-desktop-amd64.iso
---------------------------------------------------------------------------
item 60
umount: /dev/sdb3: mountpoint not found
mount /dev/sdb3 /tmp/tmp.tbI9gMJvTc
mount: special device /dev/sdb3 does not exist
 '/dev/sdb3' could not be mounted 
umount: /dev/loop-control: not mounted
umount: /dev/loop1: not mounted
umount: /dev/loop2: not mounted
umount: /dev/loop3: not mounted
umount: /dev/loop4: not mounted
umount: /dev/loop5: not mounted
umount: /dev/loop6: not mounted
umount: /dev/loop7: not mounted
/usr/sbin/mkusb: line 3339:  2962 Terminated              tail -f "$tailfile"
      2963                       | zenity --progress --title="$version - preparing persistent live drive ..." --percentage=0 --auto-close --no-cancel --window-icon="/usr/share/icons/hicolor/48x48/apps/mkusb.png" 2>> "/dev/null"
Cleanup after mkusb finished :-)
Zenity error log-file 'zerrlog'=/tmp/tmp.JjJD0x6y2Y