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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Daro, while in your current working OS, please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1534948

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https://bugs.launchpad.net/bugs/1534948

Title:
  Ubuntu 15.10 fails to boot from Sandisk USB stick

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Booting from Sandisk USB stick fails and stops on "device descriptor
  read/64, error -71" and "device not accepting address 6, error -71" on
  Dell Latitude E5420 Laptop. I tried every USB socket but without
  success. Booting with "rootwait" parameter does not help either.

  [    5.190746] ata5: SATA link down (SStatus 0 SControl 300)
  [    5.510923] ata6: SATA link down (SStatus 0 SControl 300)
  [   18.414128] usb 2-1.4: device descriptor read/64, error -110
  [   23.601028] usb 2-1.4: device descriptor read/64, error -71
  [   23.777126] usb 2-1.4: new high-speed USB device number 4 using ehci-pci
  [   23.861176] usb 2-1.4: device descriptor read/64, error -71
  [   24.049280] usb 2-1.4: device descriptor read/64, error -71
  [   24.225377] usb 2-1.4: new high-speed USB device number 5 using ehci-pci
  [   24.641614] usb 2-1.4: device not accepting address 5, error -71
  [   24.713649] usb 2-1.4: new high-speed USB device number 6 using ehci-pci
  [   25.129882] usb 2-1.4: device not accepting address 6, error -71
  [   25.131599] usb 2-1-port4: unable to enumerate USB device
  [   25.205925] usb 2-1.6: new full-speed USB device number 7 using ehci-pci
  [   25.303424] usb 2-1.6: New USB device found, idVendor=413c, idProduct=8187
  [   25.304928] usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  [   25.306409] usb 2-1.6: Product: DW375 Bluetooth Module
  [   25.307864] usb 2-1.6: Manufacturer: Dell Computer Corp
  [   25.309305] usb 2-1.6: SerialNumber: 90004EDB8100

  however unpluging and repluging usb stick makes booting process go
  further

  [   35.799849] usb 2-1.4: new high-speed USB device number 8 using ehci-pci
  [   35.893824] usb 2-1.4: New USB device found, idVendor=0781, idProduct=5583
  [   35.895294] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  [   35.896728] usb 2-1.4: Product: Ultra Fit
  [   35.898129] usb 2-1.4: Manufacturer: SanDisk
  [   35.899521] usb 2-1.4: SerialNumber: 4C530001160413113001
  [   35.905302] usb-storage 2-1.4:1.0: USB Mass Storage device detected
  [   35.907051] scsi host6: usb-storage 2-1.4:1.0
  [   35.908544] usbcore: registered new interface driver usb-storage
  [   35.911586] usbcore: registered new interface driver uas
  [   36.909422] scsi 6:0:0:0: Direct-Access     SanDisk  Ultra Fit        1.00 PQ: 0 ANSI: 6
  [   36.911179] sd 6:0:0:0: Attached scsi generic sg2 type 0
  [   36.913169] sd 6:0:0:0: [sdb] 60751872 512-byte logical blocks: (31.1 GB/28.9 GiB)
  [   36.915880] sd 6:0:0:0: [sdb] Write Protect is off
  [   36.917297] sd 6:0:0:0: [sdb] Mode Sense: 43 00 00 00
  [   36.918317] sd 6:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
  [   36.950274]  sdb: sdb1 sdb2 < sdb5 >
  [   36.955479] sd 6:0:0:0: [sdb] Attached SCSI removable disk
  [   37.254029] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null)

  My system:

  darek@LAPTOP-PORTABLE:~$ lsb_release -rd
  Description:	Ubuntu 15.10
  Release:	15.10

  darek@LAPTOP-PORTABLE:~$ uname -a
  Linux LAPTOP-PORTABLE 4.2.0-23-generic #28-Ubuntu SMP Sun Dec 27 17:47:31 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

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