*** This bug is a duplicate of bug 1685984 ***
    https://bugs.launchpad.net/bugs/1685984

I think the problem was caused by sophos antivirus. After deactivating
the on-demand scan with

sudo /opt/sophos-av/bin/savdctl disable

I had no problems.

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https://bugs.launchpad.net/bugs/1739991

Title:
  error processing archive (--unpack): unable to open '<FILE>.dpkg-new':
  Operation not permitted

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