Public bug reported:

After updating to the latest kernel, a USB Hub/switch that used to work
has a problem. It works initially when booting up my Linux Mint system,
but if you switch the USB over to another PC and back, all my Linux Mint
PC's USB ports all stop working. It is an IOGear GUS404 usb 2.0 sharing
switch and is not using external power. I've tried plugging in a
separate USB keyboard to make sure this is the case.  Hope this helps.

System:    Host: 8400-1060-LM Kernel: 4.15.0-23-generic x86_64 (64 bit gcc: 
5.4.0)
           Desktop: Cinnamon 3.6.7 (Gtk 3.18.9-1ubuntu3.3)
           Distro: Linux Mint 18.3 Sylvia
Machine:   System: Gigabyte product: Z370 HD3 v: Default string
           Mobo: Gigabyte model: Z370 HD3-CF v: x.x
           Bios: American Megatrends v: F6 date: 03/01/2018
CPU:       Hexa core Intel Core i5-8400 (-MCP-) cache: 9216 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 33696
           clock speeds: max: 4000 MHz 1: 1049 MHz 2: 3659 MHz 3: 3659 MHz
           4: 3274 MHz 5: 3245 MHz 6: 3241 MHz
Graphics:  Card: NVIDIA Device 1c02 bus-ID: 01:00.0
           Display Server: X.Org 1.18.4 drivers: nvidia (unloaded: 
fbdev,vesa,nouveau)
           Resolution: 1920x1080@60.00hz, 1920x1080@60.00hz
           GLX Renderer: GeForce GTX 1060 3GB/PCIe/SSE2
           GLX Version: 4.5.0 NVIDIA 384.130 Direct Rendering: Yes
Audio:     Card-1 Intel Device a2f0 driver: snd_hda_intel bus-ID: 00:1f.3
           Card-2 NVIDIA Device 10f1 driver: snd_hda_intel bus-ID: 01:00.1
           Sound: Advanced Linux Sound Architecture v: k4.15.0-23-generic
Network:   Card: Intel Ethernet Connection (2) I219-V
           driver: e1000e v: 3.2.6-k bus-ID: 00:1f.6
           IF: enp0s31f6 state: up speed: 1000 Mbps duplex: full mac: <filter>
Drives:    HDD Total Size: 1000.2GB (12.5% used)
           ID-1: /dev/nvme0n1 model: N/A size: 500.1GB
           ID-2: /dev/sda model: TOSHIBA_HDWD110 size: 1000.2GB
Partition: ID-1: / size: 443G used: 101G (25%) fs: ext4 dev: /dev/dm-0
           ID-2: /boot size: 472M used: 319M (72%) fs: ext2 dev: /dev/nvme0n1p1
           ID-3: swap-1 size: 17.13GB used: 0.00GB (0%) fs: swap dev: /dev/dm-1
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 27.8C mobo: 16.8C gpu: 0.0:53C
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 270 Uptime: 4 min Memory: 1339.3/15992.6MB
           Init: systemd runlevel: 5 Gcc sys: 5.4.0
           Client: Shell (bash 4.3.481) inxi: 2.2.35

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

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https://bugs.launchpad.net/bugs/1779425

Title:
  USB bug

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