apt-get dist-upgrade consistently fails

[A.L.Meyers <nospam.look@replyto.because.this.is.invalid>]

Hi!  After having done "apt-get update", the usual "apt-get
dist-upgrade" consistently returns the following error messages after
having downloaded the 67 required files:

Reading Package Lists... Done
Building Dependency Tree... Done
Calculating Upgrade... Done
67 packages upgraded, 0 newly installed, 0 to remove and 0  not upgraded.
Need to get 0B/24.7MB of archives. After unpacking 6350kB will be used.
Do you want to continue? [Y/n] 
Traceback (most recent call last):
  File "/usr/bin/apt-listchanges", line 30, in ?
    import apt_pkg
ImportError: No module named apt_pkg
E: Failure running script /usr/bin/apt-listchanges --apt || test $? -ne 10

Fix?

Lucien
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