Sorry it's taken me so long to get back to you; the affected system is
my main work computer, so I can't just go rebooting it constantly, and
I've been busy with other things.

In any event, I'm afraid I haven't had much luck with these newer
kernels. The bottom line is that to get the VirtualBox modules
installed, I need the linux-headers-{version}-generic package, and for
these newer kernels, that package depends on libssl1.1 or greater; but
the 16.04 I'm using ships with libssl1.0, and I'm unwilling to upgrade
that package and risk far greater (and worse) problems or a return to
the old "dependency hell" issues of the 1990s.

If I get the chance, I may try installing bionic on a removable drive
and try to reproduce the problem in that way.

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  System hang with Virtualbox & kernel 4.13.0-32-generic

Status in linux package in Ubuntu:
Status in linux source package in Artful:

Bug description:
  Some (maybe all) kernels in the 4.13.0 series are hanging with
  Virtualbox on my Ubuntu 16.04 laptop. When I try to launch a
  Virtualbox VM, the VM's window appears, clears to black, and then the
  mouse freezes. I do NOT see any BIOS/EFI information or boot loader in
  the VM; the hang occurs before those messages appear. (I've tried this
  with the VM set for both BIOS and EFI booting with no difference.) The
  host computer also stops responding to pings or anything else; the
  only solution seems to be to do a cold reset. I've tested this on a
  different computer running the same kernel and the latest Ubuntu 18.04
  alpha and had no problems there. Here's some data from the affected

  $ lsb_release -rd
  Description:  Ubuntu 16.04.3 LTS
  Release:      16.04

  $ cat /proc/version_signature 
  Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13

  $ dpkg -s virtualbox | grep Version
  Version: 5.0.40-dfsg-0ubuntu1.16.04.2

  This problem does NOT occur with earlier kernels, such as those in the 4.4.0 
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
   /dev/snd/controlC0:  rodsmith   2661 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2014-05-02 (1382 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: \vmlinuz-4.13.0-32-generic.efi.signed ro 
root=/dev/mapper/hostname-trusty_crypt  quiet splash  
  ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
   linux-restricted-modules-4.13.0-32-generic N/A
   linux-backports-modules-4.13.0-32-generic  N/A
   linux-firmware                             1.157.15
  Tags:  xenial
  Uname: Linux 4.13.0-32-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-09-03 (526 days ago)
  UserGroups: adm cdrom dialout dip disk libvirtd lpadmin plugdev sambashare 
sbuild sudo vboxusers
  _MarkForUpload: True 12/06/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P02AFZ.015.161206.KS
  dmi.board.asset.tag: No Asset Tag NP740U5M-X01US
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: SGL8815A0I-C01-G001-S0001+10.0.14393
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 31
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
dmi:bvnAmericanMegatrendsInc.:bvrP02AFZ.015.161206.KS:bd12/06/2016:svnSAMSUNGELECTRONICSCO.,LTD.:pn740U5M:pvrP02AFZ:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP740U5M-X01US:rvrSGL8815A0I-C01-G001-S0001+10.0.14393:cvnSAMSUNGELECTRONICSCO.,LTD.:ct31:cvrN/A: SAMSUNG ATIV 740U5M
  dmi.product.version: P02AFZ
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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