Inserted a regular USB memory stick after the most recent update and a reboot. 
I always try this after an update in case something got fixed. The memory stick 
appeared on the desktop 4 minutes and 20 seconds after I inserted it. Too long, 
wouldn't you say?
 
I tried inserting my encrypted USB memory stick. Nothing happened after 7 
minutes. Here's the dmesg stream:

[  660.298830] usb 2-1.3: new high-speed USB device number 10 using ehci-pci
[  660.416427] usb 2-1.3: New USB device found, idVendor=05dc, idProduct=a838
[  660.416430] usb 2-1.3: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[  660.416432] usb 2-1.3: Product: USB Flash Drive
[  660.416434] usb 2-1.3: Manufacturer: Lexar
[  660.416435] usb 2-1.3: SerialNumber: AAAE359Y7BWXS1P7
[  660.417374] usb-storage 2-1.3:1.0: USB Mass Storage device detected
[  660.417629] scsi host6: usb-storage 2-1.3:1.0
[  661.604039] scsi 6:0:0:0: Direct-Access     Lexar    USB Flash Drive  1100 
PQ: 0 ANSI: 6
[  661.604446] sd 6:0:0:0: Attached scsi generic sg2 type 0
[  661.605782] sd 6:0:0:0: [sdb] 62517248 512-byte logical blocks: (32.0 
GB/29.8 GiB)
[  661.606942] sd 6:0:0:0: [sdb] Write Protect is off
[  661.606946] sd 6:0:0:0: [sdb] Mode Sense: 43 00 00 00
[  661.608069] sd 6:0:0:0: [sdb] Write cache: enabled, read cache: enabled, 
doesn't support DPO or FUA
[  661.615900]  sdb: sdb1
[  661.619979] sd 6:0:0:0: [sdb] Attached SCSI removable disk
[  683.875699] usb 2-1.3: USB disconnect, device number 10
[  683.876481] sd 6:0:0:0: [sdb] Synchronizing SCSI cache
[  683.876526] sd 6:0:0:0: [sdb] Synchronize Cache(10) failed: Result: 
hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
[  987.207732] usb 2-1.3: new high-speed USB device number 11 using ehci-pci
[  987.715730] usb 2-1.3: device not accepting address 11, error -71
[  988.780035] usb 2-1-port3: Cannot enable. Maybe the USB cable is bad?
[  988.780161] usb 2-1-port3: attempt power cycle

No attempt to decrypt.

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https://bugs.launchpad.net/bugs/1773597

Title:
  USB flash drive won't mount

Status in Ubuntu:
  New
Status in nautilus package in Ubuntu:
  New

Bug description:
  [    0.000000] Linux version 4.15.0-22-generic (buildd@lgw01-amd64-013) (gcc 
version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #24-Ubuntu SMP Wed May 16 12:15:17 UTC 
2018 (Ubuntu 4.15.0-22.24-generic 4.15.17)
  [    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-22-generic 
root=UUID=870f1d77-345c-44b2-99e6-79adea07159c ro quiet splash vt.handoff=1

  Ubuntu version: Ubuntu 18.04 LTS, software is up to date

  Steps to create problem:

  1. Reboot
  2. Insert USB flash drive

  USB flash drive does not appear on desktop or in Nautilus file window

  dmesg | tail

  [ 1435.463032] usb 2-1.3: new high-speed USB device number 8 using ehci-pci
  [ 1435.685760] usb 2-1.3: New USB device found, idVendor=05dc, idProduct=c75c
  [ 1435.685763] usb 2-1.3: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
  [ 1435.685765] usb 2-1.3: Product: USB Flash Drive
  [ 1435.685766] usb 2-1.3: Manufacturer: Lexar
  [ 1435.685767] usb 2-1.3: SerialNumber: D2036779FCE9EDC016EF

  lsusb

  Bus 002 Device 007: ID 413c:8156 Dell Computer Corp. Wireless 370 Bluetooth 
Mini-card
  Bus 002 Device 006: ID 413c:8158 Dell Computer Corp. Integrated Touchpad / 
Trackstick
  Bus 002 Device 005: ID 413c:8157 Dell Computer Corp. Integrated Keyboard
  Bus 002 Device 004: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part 
of BCM2046 Bluetooth)
  Bus 002 Device 008: ID 05dc:c75c Lexar Media, Inc. 
  Bus 002 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver
  Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 001 Device 003: ID 0c45:640f Microdia 
  Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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