apt-get install/update报certificate error 解决办法

1. apt-get install/update报certificate error:

 

2. https://launchpad.net/ubuntu/bionic/amd64/ca-certificates/20210119~18.04.2 下载ca-certificates.....deb

 

 

 

 

3. dpkg -i ca-certificates_20210119_18.04.2_all.deb

 

 

4. 再apt-get install/update 成功