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[Sash <sashhhh@xxxxxxxxx>]

The issue started with installing of the 15.10 iso, as downloaded from
the Ubuntu servers, I believe it's a version of 4. 2. 0. kernel. The
last update that had the same problem was  4.2.0-21-lowlatency. Now I
have installed the latest kernel, 4.4.0. as you suggested, and the
problem is solved, thank you.

The only problem, that the Terminal report about during the installing
of the new kernel, is this:

"W: Possible missing firmware /lib/firmware/i915/skl_guc_ver4.bin for
module i915"


** Changed in: linux (Ubuntu)
       Status: Incomplete => Fix Committed

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https://bugs.launchpad.net/bugs/1526661

Title:
  Ubuntu 15.10 hangs on shutdown

Status in linux package in Ubuntu:
  Fix Committed

Bug description:
  Ubuntu 15.10 hangs on shutdown with both generic and lowlatency kernels.  In order to shutdown without forcing by pressing long on the laptop button, I need to restart, and then to shutdown, and then the shutdown takes more than a minute, which isn't the case with 14.04 which shutdowns in just few seconds. This happens with both fresh install and updated system.
  --- 
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  m          1472 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=def28845-51c2-4e63-b7c4-b6170784fa4a
  InstallationDate: Installed on 2015-12-16 (0 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Acer Aspire E1-570
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-lowlatency root=UUID=2eb5def1-1551-4c4d-ae5d-1989c495b47a ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.2.0-19.23-lowlatency 4.2.6
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-19-lowlatency N/A
   linux-backports-modules-4.2.0-19-lowlatency  N/A
   linux-firmware                               1.149.3
  Tags:  wily
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 4.2.0-19-lowlatency x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 10/08/2013
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V2.06
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: EA50_CX
  dmi.board.vendor: Acer
  dmi.board.version: V2.06
  dmi.chassis.asset.tag: Acer Asset Tag String
  dmi.chassis.type: 10
  dmi.chassis.vendor: Insyde Corp.
  dmi.chassis.version: V2.06
  dmi.modalias: dmi:bvnInsydeCorp.:bvrV2.06:bd10/08/2013:svnAcer:pnAspireE1-570:pvrV2.06:rvnAcer:rnEA50_CX:rvrV2.06:cvnInsydeCorp.:ct10:cvrV2.06:
  dmi.product.name: Aspire E1-570
  dmi.product.version: V2.06
  dmi.sys.vendor: Acer

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