Public bug reported:

When I insert USB flash drive to the USB port nothing happens. The drive
is not listed by `lsblk`.

dmesg reports:
```
[ 1262.090351] xhci_hcd 0000:04:00.3: Error while assigning device slot ID
[ 1262.090371] xhci_hcd 0000:04:00.3: Max number of devices this xHCI host 
supports is 64.
[ 1262.090378] usb usb3-port2: couldn't allocate usb_device
[ 1280.075712] xhci_hcd 0000:04:00.3: Command completion event does not match 
command
```
Ubuntu 18.04 LTS
kernel: 4.15.0-29-generic

Interestingly when I reboot while keeping drive in the port it is
mounted after reboot and fully operational.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-29-generic 4.15.0-29.31
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  ivan       2248 F.... pulseaudio
 /dev/snd/controlC0:  ivan       2248 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul 22 21:53:14 2018
HibernationDevice: RESUME=UUID=95b899e9-9c09-4cd1-8a21-f67625c9f973
InstallationDate: Installed on 2018-07-19 (4 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: HP HP EliteBook 745 G5
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-29-generic 
root=UUID=9504892d-5b9a-4ea5-a9dc-be39611a0bf7 ro quiet splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-29-generic N/A
 linux-backports-modules-4.15.0-29-generic  N/A
 linux-firmware                             1.173.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/03/2018
dmi.bios.vendor: HP
dmi.bios.version: Q81 Ver. 01.00.04
dmi.board.name: 83D5
dmi.board.vendor: HP
dmi.board.version: KBC Version 08.43.00
dmi.chassis.asset.tag: 5CG8256TVY
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias: 
dmi:bvnHP:bvrQ81Ver.01.00.04:bd06/03/2018:svnHP:pnHPEliteBook745G5:pvr:rvnHP:rn83D5:rvrKBCVersion08.43.00:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN HP EliteBook
dmi.product.name: HP EliteBook 745 G5
dmi.sys.vendor: HP

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic wayland-session

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https://bugs.launchpad.net/bugs/1783054

Title:
  USB 3.0 flash drive not mounted

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