Daro, as per http://www.dell.com/support/home/us/en/19/product- support/product/latitude-e5420/drivers?os=biosa an update to your computer's buggy, insecure, and outdated BIOS is available (A14). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything?
For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette . Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. Also, you don't have to create a new bug report. Once the BIOS is updated, if the problem is still reproducible: 1) Please provide the output of the following terminal command (not perform an apport-collect): sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date 2) Please make a comment specifically advising on if there was an improvement or not. 3) Please mark this report Status Confirmed. If it's not reproducible, please mark this as Invalid. Thank you for your understanding. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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) --- ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: darek 1257 F.... pulseaudio CurrentDesktop: LXDE DistroRelease: Ubuntu 16.04 HibernationDevice: RESUME=UUID=e7e49edd-f274-4ac4-ae57-ebbeb8082257 InstallationDate: Installed on 2015-11-10 (181 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: Dell Inc. Latitude E5420 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic root=UUID=ee3725ef-3af5-4853-84aa-d4526d8e6014 ro priority=low rootwait ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8 RelatedPackageVersions: linux-restricted-modules-4.4.0-22-generic N/A linux-backports-modules-4.4.0-22-generic N/A linux-firmware 1.157 Tags: xenial Uname: Linux 4.4.0-22-generic x86_64 UpgradeStatus: Upgraded to xenial on 2016-04-23 (17 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 07/10/2011 dmi.bios.vendor: Dell Inc. dmi.bios.version: A02 dmi.board.name: 0H5TG2 dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA02:bd07/10/2011:svnDellInc.:pnLatitudeE5420:pvr01:rvnDellInc.:rn0H5TG2:rvrA01:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E5420 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. 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