deb.torproject.org-keyring fails upgrade to 2014.08.31

On lucid (10.04):

$ sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree
Reading state information... Done Calculating upgrade... Done The following packages will be upgraded: deb.torproject.org-keyring 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 0B/5,130B of archives. After this operation, 14.3kB of additional disk space will be used. Do you want to continue [Y/n]? (Reading database ... 138785 files and directories currently installed.) Preparing to replace deb.torproject.org-keyring 2012.08.29 (using .../deb.torproject.org-keyring_2014.08.31_all.deb) ... Unpacking replacement deb.torproject.org-keyring ... dpkg-deb: file `/var/cache/apt/archives/deb.torproject.org-keyring_2014.08.31_all.deb' contains ununderstood data member data.tar.xz , giving up dpkg: error processing /var/cache/apt/archives/deb.torproject.org-keyring_2014.08.31_all.deb (--unpack): subprocess dpkg-deb --fsys-tarfile returned error exit status 2 OK Errors were encountered while processing: /var/cache/apt/archives/deb.torproject.org-keyring_2014.08.31_all.deb E: Sub-process /usr/bin/dpkg returned an error code (1)

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Username: highflux7