firefly rk3399pro npu-driver 更新方法

1、firefly开发板DRV更新命令：
sudo apt update
sudo apt install firefly-3399pronpu-driver
目前最新是1.4.0的，但是rockchip那边1.6的都已经放出来了；
2、记录一个错误
在执行sudo apt update时报错如下：
W: Failed to fetch http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/dists/bionic/InRelease Cannot initiate the connection to ppa.launchpad.net:80 (2001:67c:1560:8008::19). - connect (101: Network is unreachable) Could not connect to ppa.launchpad.net:80 (91.189.95.85), connection timed out
W: Some index files failed to download. They have been ignored, or old ones used instead
查阅资料找到解决方法：
cd /etc/apt/sources.list.d/
rm ubuntu-toolchain -r-ubuntu-test-bionic.list
重新执行sudo apt update即可正常运行