usb-creator fails - cannot generate usb disk

[Mirto Silvio Busico]

Using Kubuntu 14.10 64Bit, to reproduce

1) select Kubuntu 14.10 64bit ISO image
2) use a usb key of 8Gb or more (tried vaRIOUS BRAND)
3) select erase disk
4) assign 4Gb for the persistent disk
5) start the operation

The progress stops when it says creating persistent file 99%
From here nothing happens

Dmesg says:

[ 2722.281146] usb 3-1: new high-speed USB device number 6 using xhci_hcd
[ 2722.409760] usb 3-1: New USB device found, idVendor=0781, idProduct=557d
[ 2722.409764] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2722.409766] usb 3-1: Product: Cruzer Force
[ 2722.409768] usb 3-1: Manufacturer: SanDisk
[ 2722.409769] usb 3-1: SerialNumber: 4C530010271021100025
[ 2722.435128] usb-storage 3-1:1.0: USB Mass Storage device detected
[ 2722.435181] scsi6 : usb-storage 3-1:1.0
[ 2722.435245] usbcore: registered new interface driver usb-storage
[ 2722.438343] usbcore: registered new interface driver uas
[ 2723.435271] scsi 6:0:0:0: Direct-Access SanDisk Cruzer Force 1.26 PQ: 0 ANSI: 6
[ 2723.435697] sd 6:0:0:0: Attached scsi generic sg2 type 0
[ 2723.437195] sd 6:0:0:0: [sdc] 31266816 512-byte logical blocks: (16.0 GB/14.9 GiB)
[ 2723.439162] sd 6:0:0:0: [sdc] Write Protect is off
[ 2723.439168] sd 6:0:0:0: [sdc] Mode Sense: 43 00 00 00
[ 2723.439515] sd 6:0:0:0: [sdc] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 2723.447774] sdc: sdc1 sdc2
[ 2723.450034] sd 6:0:0:0: [sdc] Attached SCSI disk
[ 2741.921795] FAT-fs (sdc1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[ 2783.375371] ISO 9660 Extensions: Microsoft Joliet Level 3
[ 2783.377357] ISO 9660 Extensions: RRIP_1991A
[ 4634.256459] ISO 9660 Extensions: Microsoft Joliet Level 3
[ 4634.256477] ISO 9660 Extensions: RRIP_1991A
---
ApportVersion: 2.14.7-0ubuntu8.1
Architecture: amd64
DistroRelease: Ubuntu 14.10
InstallationDate: Installed on 2014-11-24 (52 days ago)
InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
Package: usb-creator (not installed)
ProcEnviron:
 LANGUAGE=it_IT
 TERM=xterm
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 3.16.0-29.39-generic 3.16.7-ckt2
Tags: utopic
UDisksDump: Error: [Errno 2] File o directory non esistente
Uname: Linux 3.16.0-29-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

_MarkForUpload: True

[Mirto Silvio Busico (m-busico)]

apport information

[Mirto Silvio Busico (m-busico)]

apport information

[Mirto Silvio Busico (m-busico)]

Also unetbootin shows the same behaviour

[Mirto Silvio Busico (m-busico)]

Tried again using unetbootin with the same result

This time I formatted the usb key as EXT4 and now I see some errors reported in dmesg:

[10957.453528] usb-storage 3-1:1.0: USB Mass Storage device detected
[10957.453697] scsi8 : usb-storage 3-1:1.0
[10958.454327] scsi 8:0:0:0: Direct-Access TDK LoR TF10 PMAP PQ: 0 ANSI: 6
[10958.454732] sd 8:0:0:0: Attached scsi generic sg2 type 0
[10960.199639] sd 8:0:0:0: [sdc] 15108480 512-byte logical blocks: (7.73 GB/7.20 GiB)
[10960.199846] sd 8:0:0:0: [sdc] Write Protect is off
[10960.199848] sd 8:0:0:0: [sdc] Mode Sense: 23 00 00 00
[10960.200052] sd 8:0:0:0: [sdc] No Caching mode page found
[10960.200054] sd 8:0:0:0: [sdc] Assuming drive cache: write through
[10960.205263] sdc: sdc1
[10960.206887] sd 8:0:0:0: [sdc] Attached SCSI removable disk
[10967.401204] EXT4-fs (sdc1): mounted filesystem with ordered data mode. Opts: (null)
[11172.459350] INFO: task extlinux:8675 blocked for more than 120 seconds.
[11172.459353] Not tainted 3.16.0-30-generic #40-Ubuntu
[11172.459354] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[11172.459356] extlinux D ffff88082fa13840 0 8675 8674 0x00000000
[11172.459359] ffff8807d3117d70 0000000000000082 ffff880743fe1e90 0000000000013840
[11172.459361] ffff8807d3117fd8 0000000000013840 ffff880743fe1e90 ffff8807d3117e98
[11172.459363] ffff8807d3117e90 7fffffffffffffff ffff880743fe1e90 ffff880743fc2868
[11172.459366] Call Trace:
[11172.459372] [<ffffffff81785509>] schedule+0x29/0x70
[11172.459374] [<ffffffff817847c9>] schedule_timeout+0x229/0x2a0
[11172.459377] [<ffffffff8108b256>] ? __queue_work+0x136/0x340
[11172.459379] [<ffffffff8108b52a>] ? __queue_delayed_work+0xaa/0x1c0
[11172.459382] [<ffffffff81786694>] wait_for_completion+0xb4/0x1e0
[11172.459386] [<ffffffff810a5670>] ? wake_up_state+0x20/0x20
[11172.459391] [<ffffffff81211ed0>] ? vfs_fsync+0x40/0x40
[11172.459394] [<ffffffff8120b355>] sync_inodes_sb+0xa5/0x1c0
[11172.459396] [<ffffffff81211ed0>] ? vfs_fsync+0x40/0x40
[11172.459399] [<ffffffff81211ee9>] sync_inodes_one_sb+0x19/0x20
[11172.459402] [<ffffffff811e4982>] iterate_supers+0xb2/0x110
[11172.459404] [<ffffffff81212165>] sys_sync+0x35/0x90
[11172.459407] [<ffffffff8178a3ad>] system_call_fastpath+0x1a/0x1f
[11292.591308] INFO: task extlinux:8675 blocked for more than 120 seconds.
[11292.591312] Not tainted 3.16.0-30-generic #40-Ubuntu
[11292.591313] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[11292.591314] extlinux D ffff88082fa13840 0 8675 8674 0x00000000
[11292.591318] ffff8807d3117d70 0000000000000082 ffff880743fe1e90 0000000000013840
[11292.591320] ffff8807d3117fd8 0000000000013840 ffff880743fe1e90 ffff8807d3117e98
[11292.591322] ffff8807d3117e90 7fffffffffffffff ffff880743fe1e90 ffff880743fc2868
[11292.591324] Call Trace:
[11292.591330] [<ffffffff81785509>] schedule+0x29/0x70
[11292.591333] [<ffffffff817847c9>] schedule_timeout+0x229/0x2a0
[11292.591336] [<ffffffff8108b256>] ? __queue_work+0x136/0x340
[11292.591338] [<ffffffff8108b52a>] ? ...