Bug#800501: SystemError on missing files in /var/lib/apt/lists

[Sebastien Bacher <seb128@ubuntu.com>]

Package: python-apt
Version: 1.1.0~alpha3

Unsure when/how that is triggered but oneconf seems to hit that often in
Ubuntu

example

"Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/oneconf/packagesethandler.py",
line 63, in update
    newpkg_list = self.distro.compute_local_packagelist()
  File "/usr/lib/python3/dist-packages/oneconf/distributor/Ubuntu.py",
line 42, in compute_local_packagelist
    with apt.Cache() as apt_cache:
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 113, in __init__
    self.open(progress)
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 166, in open
    self._records = apt_pkg.PackageRecords(self._cache)
SystemError: E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_restricted_binary-i386_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_multiverse_binary-i386_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_universe_binary-i386_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_main_binary-i386_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_restricted_binary-amd64_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_multiverse_binary-amd64_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_universe_binary-amd64_Packages
- open (2: No such file or directory)"