It is coming from the appstream source package.
Steps to reproduce:
1. Create a minimal Ubuntu 20.04 chroot with all packages that install files in
/etc/apt/apt.conf.d on my Ubuntu 20.04 VM installed (that is,
update-notifier-common, debconf, aptdaemon, apt-config-icons,
apt-config-icons-hidpi, packagekit, appstream, apt, unattended-upgrades,
ubuntu-advantage-tools, snapd and command-not-found).
2. Get the source code for all packages in the chroot with apt source
SOURCE_PACKAGE_NAMES.
3. Run the following command:
$ grep -Fr 'Can not add an empty (zero-length) key to the cache'
appstream-0.12.10/.pc/01_less-long-token-noise.patch/src/as-cache.c:
"Can not add an empty (zero-length) key to the cache");
appstream-0.12.10/src/as-cache.c: "Can not add an
empty (zero-length) key to the cache");
** Changed in: ubuntu
Status: Incomplete => New
** Package changed: ubuntu => appstream (Ubuntu)
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https://bugs.launchpad.net/bugs/1982198
Title:
apt update: Can not add an empty (zero-length) key to the cache
Status in appstream package in Ubuntu:
New
Bug description:
When running sudo apt update, I get the following warning after the
"Fetched" message:
Can not add an empty (zero-length) key to the cache
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: apt 2.0.9
ProcVersionSignature: Ubuntu 5.15.0-41.44~20.04.1-generic 5.15.39
Uname: Linux 5.15.0-41-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.24
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Jul 19 16:44:36 2022
InstallationDate: Installed on 2022-04-26 (84 days ago)
InstallationMedia: Ubuntu 20.04.4 LTS "Focal Fossa" - Release amd64 (20220223)
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)
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