Not detecting external USB hard drive or any usb stick
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Currently I have the HD and the USB stick plugged into different USB ports. This is what I guet:

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$ sudo dmesg | grep usb
[    0.321289] usbcore: registered new interface driver usbfs
[    0.321298] usbcore: registered new interface driver hub
[    0.321356] usbcore: registered new device driver usb
[    5.283364] usb 5-5: new high-speed USB device number 8 using ehci-pci
[    7.947868] usb-storage 5-5:1.0: USB Mass Storage device detected
[    7.947949] scsi2 : usb-storage 5-5:1.0
[    7.948139] usbcore: registered new interface driver usb-storage
[  333.009683] usb 5-5: USB disconnect, device number 8



$ sudo fdisk -l

Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x1549f232

Device    Boot     Start       End    Blocks  Id System
/dev/sda1 *         2048  97677828  48837890+ 83 Linux
/dev/sda2       97677829 974814546 438568359  83 Linux
/dev/sda3      974814547 976767119    976286+ 83 Linux


$ lsusb
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub