libpam-afs-session causes sudo -i to give an error about a non-existent group

[John F. Godfrey]

If I have afs-session selected with pam-auth-update (which I want so I get an afs token), it causes an error when I do sudo -i. It says that there's no such group, and gives a generated group number of 6 digits, which gets incremented every time I sudo in a particular session.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: libpam-afs-session 2.6-1
ProcVersionSignature: Ubuntu 4.18.0-16.17~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-16-generic x86_64
NonfreeKernelModules: openafs
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
Date: Fri Mar 15 19:13:12 2019
InstallationDate: Installed on 2019-03-14 (2 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
ProcEnviron:
 TERM=screen-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: libpam-afs-session
UpgradeStatus: No upgrade log present (probably fresh install)