联想c940指纹读取器无法在Ubuntu上运行

我有一台带指纹识别器的Lenovo Yoga C940。我使用ubuntu 20.04 LTS。 Hardinfo告诉我我有一个wacom HID 51E2 Finger设备。

在激活PAM-auth-update(有效)后,我尝试通过用户设置使用它,但随后它告诉我“无法访问任何指纹读取器”。我知道它可以在Windows 10中使用。

我尝试安装Fingerprint-gui和fprint。两者都给我错误:

For issues with the packaging contact the package maintainer: https://launchpad.net/~jurenka More info: https://launchpad.net/~fingerprint/+archive/ubuntu/fingerprint-gui ...
Hit:6 http://nl.archive.ubuntu.com/ubuntu focal-backports InRelease
Err:7 http://ppa.launchpad.net/fingerprint/fprint/ubuntu focal Release
404 Not Found [IP: 91.189.95.83 80] Get:8 http://security.ubuntu.com/ubuntu focal-security InRelease [107 kB]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/fingerprint/fprint/ubuntu focal Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.

我搜索了IP,但没有与指纹读取器结合使用的真实答案。

我究竟做错了什么?