What exactly did you do to fix this, Alexander? My apt is hosed by this same issue right now.Perhaps I suffered from some other issue. I had safe-rm installed where /usr/bin/rm is a symbolic link to /usr/bin/safe-rm which is a perl script. So I just removed the link (/bin/rm /usr/bin/rm :-) ) and then the upgrade of perl worked as expected. As safe-rm doesn't seem to work with the new perl after a complete purge--re-install cycle I reported another Bug (#550946) which was merged with #550938, and finally purged it from my computer.
Best regards, -- Alexander Mader <email@example.com>
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