Workaround suggested as comment #13 does also not work for me...

root@MacBookAir:~# export SUDO_USER=root
root@MacBookAir:~# export SUDO_UID=0
root@MacBookAir:~# export SUDO_COMMAND=/bin/bash
root@MacBookAir:~# export SUDO_GID=0
root@MacBookAir:~# update-manager -d
Neue Veröffentlichungen von Ubuntu werden gesucht
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
»xenial.tar.gz« wird gegenüber »xenial.tar.gz.gpg« legitimiert 
»xenial.tar.gz« wird entpackt
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-rwci_0e6/xenial", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-rwci_0e6/DistUpgrade/DistUpgradeMain.py", 
line 229, in main
    app = DistUpgradeController(view, options, datadir=options.datadir)
  File 
"/tmp/ubuntu-release-upgrader-rwci_0e6/DistUpgrade/DistUpgradeController.py", 
line 159, in __init__
    self.quirks = DistUpgradeQuirks(self, self.config)
  File 
"/tmp/ubuntu-release-upgrader-rwci_0e6/DistUpgrade/DistUpgradeQuirks.py", line 
63, in __init__
    self._uid = os.environ['SUDO_UID']
  File "/usr/lib/python3.4/os.py", line 633, in __getitem__
    raise KeyError(key) from None
KeyError: 'SUDO_UID'
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/problem_report.py", line 480, in 
add_to_existing
    self.write(f)
  File "/usr/lib/python3/dist-packages/problem_report.py", line 435, in write
    crc = zlib.crc32(block, crc)
TypeError: 'str' does not support the buffer interface

Original exception was:
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-rwci_0e6/xenial", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-rwci_0e6/DistUpgrade/DistUpgradeMain.py", 
line 229, in main
    app = DistUpgradeController(view, options, datadir=options.datadir)
  File 
"/tmp/ubuntu-release-upgrader-rwci_0e6/DistUpgrade/DistUpgradeController.py", 
line 159, in __init__
    self.quirks = DistUpgradeQuirks(self, self.config)
  File 
"/tmp/ubuntu-release-upgrader-rwci_0e6/DistUpgrade/DistUpgradeQuirks.py", line 
63, in __init__
    self._uid = os.environ['SUDO_UID']
  File "/usr/lib/python3.4/os.py", line 633, in __getitem__
    raise KeyError(key) from None
KeyError: 'SUDO_UID'

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https://bugs.launchpad.net/bugs/1570947

Title:
  Trusty to Xenial upgrade KeyError: 'SUDO_UID'

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