Pulled from /var/log/apt/history.log, chasing down taskwarrior's dependencies, as found by reportbug. Taskwarrior was functioning normally for me through at least August 23. I believe that it failed following the August 27 update.
I haven't changed anything in my taskwarrior configuration in many months -- it was a real surprise to type 't sync' (aliased) this week and see it fail. Versions of packages taskwarrior depends on: ii libc6 2.27-5 ii libgcc1 1:8.2.0-4 ii libgnutls30 3.5.19-1 ii libstdc++6 8.2.0-4 ii libuuid1 2.32.1-0.1 August 17: libgcc1:amd64 (1:8.1.0-12, 1:8.2.0-3) libgcc1:i386 (1:8.1.0-12, 1:8.2.0-3) libstdc++6:amd64 (8.1.0-12, 8.2.0-3) libstdc++6:i386 (8.1.0-12, 8.2.0-3) libuuid1:amd64 (2.32-0.1, 2.32-0.4) libuuid1:i386 (2.32-0.1, 2.32-0.4) August 21: libgcc1:amd64 (1:8.2.0-3, 1:8.2.0-4) libgcc1:i386 (1:8.2.0-3, 1:8.2.0-4) libstdc++6:amd64 (8.2.0-3, 8.2.0-4) libstdc++6:i386 (8.2.0-3, 8.2.0-4) libuuid1:amd64 (2.32-0.4, 2.32.1-0.1) libuuid1:i386 (2.32-0.4, 2.32.1-0.1) August 27: libc6-i386:amd64 (2.27-5, automatic) <-- this is the only hit when grepping 'libc6'