debian wget 报ERROR: The certificate of ‘xxx’ is not trusted.

 # wget https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tar.xz
 --2019-01-11 15:04:41-- https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tar.xz
 Resolving www.python.org (www.python.org)... 151.101.0.223, 151.101.64.223, 151.101.128.223, ...
 Connecting to www.python.org (www.python.org)|151.101.0.223|:443... connected.
 ERROR: The certificate of ‘www.python.org’ is not trusted.
 ERROR: The certificate of ‘www.python.org’ hasn't got a known issuer.

第一种解决方式：

 # wget --no-check-certificate https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tar.xz
 --2019-01-11 15:05:21-- https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tar.xz
 Resolving www.python.org (www.python.org)... 151.101.0.223, 151.101.64.223, 151.101.128.223, ...
 Connecting to www.python.org (www.python.org)|151.101.0.223|:443... connected.
 WARNING: The certificate of ‘www.python.org’ is not trusted.
 WARNING: The certificate of ‘www.python.org’ hasn't got a known issuer.
 HTTP request sent, awaiting response... 200 OK
 Length: 17212420 (16M) [application/octet-stream]
 Saving to: ‘Python-3.6.8.tar.xz’

 Python-3.6.8.tar.xz 100%[=======================================================================================================>] 16.42M 85.4KB/s in 97s

 2019-01-11 15:06:58 (173 KB/s) - ‘Python-3.6.8.tar.xz’ saved [17212420/17212420]

第二种解决方式：

# apt install -y ca-certificates