It looks like something had become corrupt on disk.
Setting up python3-distupgrade (1:15.10.14.4) ...
File "/usr/lib/python3/dist-packages/DistUpgrade/GtkProgress.py", line 49
selfwindow_fetch.get_window().set_functions(Gdk.WMFunction.MOVE)
^
SyntaxError: invalid syntax
dpkg: error processing package python3-distupgrade (--configure):
subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of ubuntu-release-upgrader-core:
Please try reinstalling the package via 'sudo apt-get install
--reinstall python3-distupgrade'.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1547776
Title:
package python3-distupgrade 1:15.10.14.4 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1
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