package apt-xapian-index 0.45ubuntu4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.

Here's the error message from the logs for easy reading:

Setting up apt-xapian-index (0.45ubuntu4) ...
dpkg-query: error: parsing file '/var/lib/dpkg/updates/0014' near line 0:
 newline in field name `#padding'
Traceback (most recent call last):
  File "/usr/bin/pycompile", line 289, in <module>
    main()
  File "/usr/bin/pycompile", line 262, in main
    options.force, options.optimize, e_patterns)
  File "/usr/bin/pycompile", line 154, in compile
    for fn, versions_to_compile in filter_files(files, e_patterns, versions):
  File "/usr/bin/pycompile", line 109, in filter_files
    for fn in files:
  File "/usr/share/python/debpython/files.py", line 77, in filter_out_ext
    for fn in files:
  File "/usr/share/python/debpython/namespace.py", line 77, in add_namespace_files
    for fn in files:
  File "/usr/share/python/debpython/files.py", line 69, in filter_public
    for fn in files:
  File "/usr/share/python/debpython/files.py", line 53, in from_package
    raise Exception("cannot get content of %s" % package_name)
Exception: cannot get content of apt-xapian-index