ubuntu-updater hangs after finishing the update

[ernsteiswuerfel]

fresh Ubuntu Mate 16.04 install on a Powerbook 5,6: ubuntu-updater seems to finish the update but hangs afterwards.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: update-manager 1:15.10.3
ProcVersionSignature: Ubuntu 4.4.0-4.19-powerpc-smp 4.4.1
Uname: Linux 4.4.0-4-powerpc-smp ppc
ApportVersion: 2.19.4-0ubuntu2
Architecture: powerpc
CurrentDesktop: MATE
Date: Sun Feb 14 13:52:16 2016
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'window-width' b'485'
 b'com.ubuntu.update-manager' b'launch-time' b'1455452752'
InstallationDate: Installed on 2016-02-13 (0 days ago)
InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha powerpc (20160213)
InterpreterPath: /usr/bin/python3.5
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=de_AT:de
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_AT.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[ernsteiswuerfel (erhard-f)]

Seems to be fixed in Ubuntu MATE 16.10. But sometimes you have to wait ages until ubuntu-updater finishes, e.g. more than 20min on my PowerBook G4 5,8.

Updating via apt-get update && apt-get dist-upgrade is way faster.