Upgrade Failure

14.04 to 16.04 update failed:

CURRENT OS:

Description: Ubuntu 14.04.4 LTS
Release: 14.04

admin@ubuntu_14:~$ apt-cache policy pkgname
N: Unable to locate package pkgname

TERMINAL OUTPUT TO START UPGRADE:

admin@ubuntu_14:~$ sudo update-manager -d
[sudo] password for admin:
WARNING:root:estimate_kernel_size_in_boot() returned '0'?
Checking for a new Ubuntu release
authenticate 'xenial.tar.gz' against 'xenial.tar.gz.gpg'
extracting 'xenial.tar.gz'
admin@ubuntu_14:~$

ERROR MESSAGE ON FAILURE:

Could not determine the upgrade

An unresolvable problem occurred while calculating the upgrade.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

TERMINAL OUTPUT DURING BUG REPORT:

admin@ubuntu_14:~$ ubuntu-bug ubuntu-release-upgrader-core
admin@ubuntu_14:~$ [20257:20291:0421/134455:ERROR:device_id_linux.cc(86)] Could not find appropriate disk uuid.
[20257:20291:0421/134455:ERROR:device_id_linux.cc(89)] DeviceID=loop0, uuid=fa202bd3-803a-4583-ac34-50a4b8f59b41
[0421/124457:WARNING:ipc_message_attachment_set.cc(57)] MessageAttachmentSet destroyed with unconsumed descriptors: 0/1
[1,3706309120:12:44:57.578202] Native Client module will be loaded at base address 0x000018fc00000000

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
Uname: Linux 3.12.6 x86_64
NonfreeKernelModules: vfio_pci vfio vringh virtio_scsi virtio_pci virtio_mmio virtio_console virtio_balloon virtio_rng virtio_blk virtio_net virtio_ring virtio vhost_net vhost macvtap macvlan kvm_intel kvm xt_mark iptable_mangle ppp_deflate tun bsd_comp ppp_mppe ppp_async ppp_generic crc_ccitt slhc iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi iscsi_target_mod target_core_file target_core_iblock target_core_mod fbdisk btusb bluetooth ipt_MASQUERADE iptable_nat iptable_filter nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack bonding bridge stp ipv6 8021q uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core snd_usb_caiaq snd_usb_audio snd_usbmidi_lib snd_seq_midi snd_rawmidi fnotify udf isofs iTCO_wdt rtcmod cryptodev ufsd jnl pl2303 usbserial intel_ips drbd flashcache dm_thin_pool dm_bio_prison dm_persistent_data dm_bufio hal_netlink coretemp igb mpt2sas scsi_transport_sas raid_class usb_storage xhci_hcd usblp uhci_hcd ehci_pci ehci_hcd
ApportVersion: 2.14.1-0ubuntu3.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Thu Apr 21 13:41:51 2016
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-04-21 (0 days ago)
VarLogDistupgradeTermlog: