Can't use number pad for password prompt full disk encryption

[Bas de Bruijne]

When the entering my password for full disk encryption, I cannot use the number pad to enter numbers. The number pad keys enter several characters in the password prompt and that occasionally makes the password prompt crash.

Entering the numbers using the top keyboard row has no problems.

Ubuntu 20.04.3 LTS
5.11.0-37-generic

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.11.0-37-generic 5.11.0-37.41~20.04.2
ProcVersionSignature: Ubuntu 5.11.0-37.41~20.04.2-generic 5.11.22
Uname: Linux 5.11.0-37-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 4 09:08:23 2021
InstallationDate: Installed on 2021-07-30 (65 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: linux-signed-hwe-5.11
UpgradeStatus: No upgrade log present (probably fresh install)