unity8-lxc-setup stalls at "Determining latest LXC image release..."

[Asvin]

When trying to setup unity8-lxc, the setup does not progress at all for several minutes. Looking at the System Monitor I cannot see any significant network traffic or CPU usage. This is my console log after aborting the setup manually

sudo unity8-lxc-setup
Determining latest LXC image release...
^CTraceback (most recent call last):
  File "/usr/bin/unity8-lxc-setup", line 129, in <module>
    current_release = get_latest_lxc_image(architecture)
  File "/usr/bin/unity8-lxc-setup", line 79, in get_latest_lxc_image
    output = proc.communicate()[0]
  File "/usr/lib/python3.5/subprocess.py", line 1052, in communicate
    stdout = self.stdout.read()
KeyboardInterrupt

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-16-generic 4.4.0-16.32
ProcVersionSignature: Ubuntu 4.4.0-16.32-generic 4.4.6
Uname: Linux 4.4.0-16-generic x86_64
ApportVersion: 2.20.1-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: asvin 2088 F.... pulseaudio
 /dev/snd/controlC1: asvin 2088 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue Apr 5 17:16:51 2016
HibernationDevice: RESUME=UUID=f716048f-ce0e-4825-b3c4-563fa743242a
InstallationDate: Installed on 2016-03-23 (12 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
MachineType: Dell Inc. Venue 11 Pro 7140
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-16-generic.efi.signed root=UUID=a9cb1c53-fcf1-4691-a246-24b90dd908c6 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-16-generic N/A
 linux-backports-modules-4.4.0-16-generic N/A
 linux-firmware 1.157
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/27/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: 0XMVMH
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA09:bd10/27/2015:svnDellInc.:pnVenue11Pro7140:pvr:rvnDellInc.:rn0XMVMH:rvrA00:cvnDellInc.:ct8:cvr:
dmi.product.name: Venue 11 Pro 7140
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.6 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc2-wily/

[Asvin (m-launch7ad-u)]

Entered wrong package, bug related to unity8-lxc, sorry.

[Asvin (m-launch7ad-u)]

The problem may be related to a blocked port for the internet connection. Using a different access point solved the problem for me.