ubuntu 20.04 启用指纹登录

一、介绍
二、更新指纹识别器驱动
三、添加指纹
参考资料及附录

一、介绍

为了开发的时候更顺滑、问题更少，把 ThinkPad P53 装上了Ubuntu 20.04 TLS，指望用上几年。

换成 Ubuntu 以后，在设置里面发现支持指纹登陆，但是直接使用会报错，因为指纹器无法识别。

二、更新指纹识别器驱动

在 ubuntu 20.04 中，一些硬件的固件推荐使用 fwupd 来更新，这个命令默认已经安装了。

1、更新系统
```
$ sudo apt update
$ sudo apt upgrade -y
```
这么做是为了更新 fwupd，顺便更新系统中的各个软件。

2、显示 fwupd 检测到的所有设备：

$ fwupdmgr get-devices

输出：

20QQA01JCD
│
├─Thunderbolt Controller:
│     Device ID:           5c186bd735e96445c0730ae49e424b1035e1322b
│     Summary:             Unmatched performance for high-speed I/O
│     Current version:     59.00
│     Vendor:              Lenovo (TBT:0x0109)
│     GUIDs:               d358cf61-abca-5232-bfde-8a92e1a5b100
│                          64e51565-c48d-55e1-b59f-ca1afff199f4
│     Device Flags:        • Internal device
│                          • Updatable
│                          • Requires AC power
│                          • Device stages updates
│   
├─Prometheus:
│ │   Device ID:           d432baa2162a32c1554ef24bd8281953b9d07c11
│ │   Summary:             Fingerprint reader
│ │   Current version:     10.01.3121519
│ │   Vendor:              Synaptics (USB:0x06CB)
│ │   Install Duration:    2 seconds
│ │   GUIDs:               xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
│ │                        xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
│ │   Device Flags:        • Updatable
│ │                        • Supported on remote server
│ │                        • Cryptographic hash verification is available
│ │

其中 Summary: Fingerprint reader 就是指纹识别器。 Device Flags 中的 Updatable 说明有可用的升级。

3、列出系统上任何设备可用的更新：

$ fwupdmgr get-updates

输出：

• Thunderbolt Controller has no available firmware updates
• Prometheus IOTA Config has the latest available firmware version
• SAMSUNG MZVLB1T0HBLR-000L7 has no available firmware updates
• System Firmware has the latest available firmware version
• UEFI Device Firmware has no available firmware updates
• UEFI Device Firmware has the latest available firmware version
• UEFI Device Firmware has no available firmware updates
20QQA01JCD
│
└─Prometheus:
  │   Device ID:           d432baa2162a32c1554ef24bd8281953b9d07c11
  │   Summary:             Fingerprint reader
  │   Current version:     10.01.3121519
  │   Vendor:              Synaptics (USB:0x06CB)
  │   Install Duration:    2 seconds
  │   GUIDs:               xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
  │                        xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
  │   Device Flags:        • Updatable
  │                        • Supported on remote server
  │                        • Cryptographic hash verification is available
  │ 
  └─Prometheus Fingerprint Reader Device Update:
        New version:       10.01.3158804
        Remote ID:         lvfs
        Summary:           Firmware for the Synaptics Prometheus Fingerprint Reader device
        License:           Proprietary
        Size:              400.3 kB
        Vendor:            Synaptics Inc.
        Duration:          2 seconds
        Flags:             is-upgrade
        Description:       New features and enhancements:

         • Support Linux system