Public bug reported:

When trying to use the guestmount, it fails to read the kernel:

supermin: kernel: picked kernel vmlinuz-4.4.0-34-generic
cp: cannot open '/boot/vmlinuz-4.4.0-34-generic' for reading: Permission denied
supermin: cp -p '/boot/vmlinuz-4.4.0-34-generic' 
'/var/tmp/.guestfs-1000/appliance.d.s2vmg60k/kernel': command failed, see 
earlier errors
libguestfs: error: /usr/bin/supermin exited with error status 1, see debug 
messages above
libguestfs: trace: launch = -1 (error)
libguestfs: trace: close
libguestfs: closing guestfs handle 0x1892d20 (state 0)
libguestfs: command: run: rm
libguestfs: command: run: \ -rf /tmp/libguestfs680ObV

Related to this bug "The kernel is no longer readable by non-root
users":

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/759725

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: libguestfs-tools 1:1.32.2-4ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Mar 16 12:23:04 2017
InstallationDate: Installed on 2013-06-03 (1381 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 
(20130213)
SourcePackage: libguestfs
UpgradeStatus: Upgraded to xenial on 2016-08-29 (198 days ago)

** Affects: libguestfs (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1673431

Title:
  Make kernel readable by non-root users

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