Comment 2 for bug 1719174

I add "print(cand.record)" before line 261 of "debtags" and get the offending record?

Package: linux-image-4.4.0-57-lowlatency
Architecture: i386
Version: 4.4.0-57.78

… NO special char there, BUT in the next entry in /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_xenial-security_main_binary-amd64_Packages

Package: linux-image-4.4.0-59-generic
Architecture: amd64
Version: 4.4.0-59.80
Priority: optional
Section: kernel
Source: linux
Origin: Ubuntu
Maintainer: Ubuntu Kernel Team <email address hidden>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 63212
Provides: fuse-module, ivtv-modules, kvm-api-4, linux-image, redhat-cluster-modules, spl-dkms, virtualb<EF>x-guest-modules, zfs-dkms

There it is - virtualbïx-guest-modules!

s/ï/o/ - write file, no more failure!