After reading carefully, I was able to recreate this by installing shim- signed.
etting up shim-signed (1.18~16.04.1+0.8-0ubuntu2) ... find: Error in sys.excepthook: Traceback (most recent call last): File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook from apport.fileutils import likely_packaged, get_recent_crashes File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module> from apport.report import Report File "/usr/lib/python3/dist-packages/apport/report.py", line 15, in <module> import xml.dom, xml.dom.minidom ImportError: No module named 'xml.dom' Original exception was: Traceback (most recent call last): File "/tmp/ubuntu-release-upgrader-op_78f0n/xenial", line 8, in <module> sys.exit(main()) File "/tmp/ubuntu-release-upgrader-op_78f0n/DistUpgrade/DistUpgradeMain.py", line 242, in main if app.run(): File "/tmp/ubuntu-release-upgrader-op_78f0n/DistUpgrade/DistUpgradeController.py", line 1876, in run return self.fullUpgrade() File "/tmp/ubuntu-release-upgrader-op_78f0n/DistUpgrade/DistUpgradeController.py", line 1841, in fullUpgrade if not self.doDistUpgrade(): File "/tmp/ubuntu-release-upgrader-op_78f0n/DistUpgrade/DistUpgradeController.py", line 1182, in doDistUpgrade res = self.cache.commit(fprogress,iprogress) File "/tmp/ubuntu-release-upgrader-op_78f0n/DistUpgrade/DistUpgradeCache.py", line 267, in commit apt.Cache.commit(self, fprogress, iprogress) File "/usr/lib/python3/dist-packages/apt/cache.py", line 501, in commit # which is less than optimal! File "/usr/lib/python3/dist-packages/apt/cache.py", line 465, in install_archives File "/tmp/ubuntu-release-upgrader-op_78f0n/DistUpgrade/DistUpgradeView.py", line 234, in run res = os.WEXITSTATUS(self.wait_child()) File "/tmp/ubuntu-release-upgrader-op_78f0n/DistUpgrade/DistUpgradeView.py", line 200, in wait_child self.update_interface() File "/tmp/ubuntu-release-upgrader-op_78f0n/DistUpgrade/DistUpgradeViewNonInteractive.py", line 229, in update_interface sys.stdout.write("%s" % s.decode(locale.getpreferredencoding())) UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe2 in position 0: unexpected end of data -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1604160 Title: Unicode decode error in noninteractive frontend on t->x To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1604160/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs