iDRAC with Lifecycle Controller 4.10.10.10 won't install

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I've got some R640s with firmware 4.00.00.00 for the iDRAC with Lifecycle Controller.  The 'dsu' output tells me 4.10.10.10 is available.  It's downloaded and install is attempted.  At which point this happens:

Fetching iDRAC-with-Lifecycle-Controller_Firmware_KTC95_LN_4.10.10.10_A00 ...
Installing iDRAC-with-Lifecycle-Controller_Firmware_KTC95_LN_4.10.10.10_A00
Collecting inventory...
.
Running validation...

iDRAC

The version of this Update Package is newer than the currently installed version.
Software application name: iDRAC
Package version: 4.10.10.10
Installed version: 4.00.00.00


Executing update...
WARNING: DO NOT STOP THIS PROCESS OR INSTALL OTHER PRODUCTS WHILE UPDATE IS IN PROGRESS.
THESE ACTIONS MAY CAUSE YOUR SYSTEM TO BECOME UNSTABLE!
...................................................................mount: /dev/sdb is already mounted or /media/scrtch busy
   USB Device is not found
.....................................................................mount: /dev/sdb is already mounted or /media/scrtch busy
   USB Device is not found
....................................................................mount: /dev/sdb is already mounted or /media/scrtch busy
   USB Device is not found
..
The update completed successfully.
Installed successfully



Alternatively, this is what you see if you do it on console:


Fetching iDRAC-with-Lifecycle-Controller_Firmware_KTC95_LN_4.10.10.10_A00 ...
Installing iDRAC-with-Lifecycle-Controller_Firmware_KTC95_LN_4.10.10.10_A00
Collecting inventory...
............................................................
Running validation...

iDRAC

The version of this Update Package is newer than the currently installed version.
Software application name: iDRAC
Package version: 4.10.10.10
Installed version: 4.00.00.00


Executing update...
WARNING: DO NOT STOP THIS PROCESS OR INSTALL OTHER PRODUCTS WHILE UPDATE IS IN PROGRESS.
THESE ACTIONS MAY CAUSE YOUR SYSTEM TO BECOME UNSTABLE!
.....[  281.341201] usb 1-14.1.2: new high-speed USB device number 7 using xhci_hcd
[  281.435088] usb 1-14.1.2: New USB device found, idVendor=0624, idProduct=0250, bcdDevice= 0.00
[  281.443687] usb 1-14.1.2: New USB device strings: Mfr=4, Product=5, SerialNumber=6
[  281.451242] usb 1-14.1.2: Product: Mass Storage Function
[  281.456547] usb 1-14.1.2: Manufacturer: Avocent
[  281.461075] usb 1-14.1.2: SerialNumber: 20180726-0
.[  281.468750] usb-storage 1-14.1.2:1.0: USB Mass Storage device detected
[  281.475472] scsi host19: usb-storage 1-14.1.2:1.0
[  282.482713] scsi 19:0:0:0: Direct-Access     Linux    scrtch           0399 PQ: 0 ANSI: 0 CCS
[  282.491961] sd 19:0:0:0: Attached scsi generic sg1 type 0
[  282.492927] sd 19:0:0:0: Power-on or device reset occurred
[  282.496978] sd 19:0:0:0: [sdb] 630784 512-byte logical blocks: (322 MB/308 MiB)
.[  282.617305] sd 19:0:0:0: [sdb] Write Protect is off
[  282.737033] sd 19:0:0:0: [sdb] No Caching mode page found
[  282.742438] sd 19:0:0:0: [sdb] Assuming drive cache: write through
[  282.989704]  sdb:
[  283.236089] sd 19:0:0:0: [sdb] Attached SCSI removable disk
.............................................................mount: /dev/sdb is already mounted or /my
   USB Device is not found
[  345.791929] usb 1-14.1.2: USB disconnect, device number 7
.......[  353.364321] usb 1-14.1.2: new high-speed USB device number 8 using xhci_hcd
[  353.458039] usb 1-14.1.2: New USB device found, idVendor=0624, idProduct=0250, bcdDevice= 0.00
[  353.466644] usb 1-14.1.2: New USB device strings: Mfr=4, Product=5, SerialNumber=6
[  353.474202] usb 1-14.1.2: Product: Mass Storage Function
[  353.479505] usb 1-14.1.2: Manufacturer: Avocent
[  353.484030] usb 1-14.1.2: SerialNumber: 20180726-0
[  353.491693] usb-storage 1-14.1.2:1.0: USB Mass Storage device detected
[  353.498449] scsi host20: usb-storage 1-14.1.2:1.0
.[  354.504888] scsi 20:0:0:0: Direct-Access     Linux    scrtch           0399 PQ: 0 ANSI: 0 CCS
[  354.513973] sd 20:0:0:0: Attached scsi generic sg1 type 0
[  354.515558] sd 20:0:0:0: Power-on or device reset occurred
[  354.519312] sd 20:0:0:0: [sdb] 630784 512-byte logical blocks: (322 MB/308 MiB)
.[  354.641193] sd 20:0:0:0: [sdb] Write Protect is off
[  354.770980] sd 20:0:0:0: [sdb] No Caching mode page found
[  354.776378] sd 20:0:0:0: [sdb] Assuming drive cache: write through
[  355.031621]  sdb:
[  355.284182] sd 20:0:0:0: [sdb] Attached SCSI removable disk
...........................................................mount: /dev/sdb is already mounted or /medy
   USB Device is not found
.[  416.537773] usb 1-14.1.2: USB disconnect, device number 8
......[  422.832430] usb 1-14.1.2: new high-speed USB device number 9 using xhci_hcd
[  422.926267] usb 1-14.1.2: New USB device found, idVendor=0624, idProduct=0250, bcdDevice= 0.00
[  422.934872] usb 1-14.1.2: New USB device strings: Mfr=4, Product=5, SerialNumber=6
[  422.942427] usb 1-14.1.2: Product: Mass Storage Function
[  422.947734] usb 1-14.1.2: Manufacturer: Avocent
[  422.952256] usb 1-14.1.2: SerialNumber: 20180726-0
[  422.960031] usb-storage 1-14.1.2:1.0: USB Mass Storage device detected
[  422.966831] scsi host21: usb-storage 1-14.1.2:1.0
.[  423.973209] scsi 21:0:0:0: Direct-Access     Linux    scrtch           0399 PQ: 0 ANSI: 0 CCS
[  423.982466] sd 21:0:0:0: Attached scsi generic sg1 type 0
[  423.983392] sd 21:0:0:0: Power-on or device reset occurred
[  423.987488] sd 21:0:0:0: [sdb] 630784 512-byte logical blocks: (322 MB/308 MiB)
[  424.100687] sd 21:0:0:0: [sdb] Write Protect is off
[  424.220369] sd 21:0:0:0: [sdb] No Caching mode page found
[  424.225776] sd 21:0:0:0: [sdb] Assuming drive cache: write through
[  424.470454]  sdb:
[  424.709054] sd 21:0:0:0: [sdb] Attached SCSI removable disk
.............................................................mount: /dev/sdb is already mounted or /my
   USB Device is not found
[  487.538981] usb 1-14.1.2: USB disconnect, device number 9
..
The update completed successfully.
Installed successfully

However, the firmware isn't updated.  Even after a reboot and second attempt, no joy.  I don't have a /dev/sdb device in the systems.

Ben