尝试安装

rclone：sudo -v ; curl https://rclone.org/install.sh | sudo bash

提示如下错误：

curl: (60) SSL certificate problem: certificate has expired

More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"  of Certificate Authority (CA) public keys (CA certs).

If the default  bundle file isn't adequate, you can specify an alternate file  using the --cacert option.

If this HTTPS server uses a certificate signed by a CA represented in  the bundle, the certificate verification probably failed due to a  problem with the certificate (it might be expired, or the name might  not match the domain name in the URL).

If you'd like to turn off curl's verification of the certificate, use  the -k (or --insecure) option.

开始时以为是证书问题，后来查询后才明白是curl版本太旧了，主机是ubuntu server 16.04，curl版本是7.40

因此尝试升级curl，但是碍于OS 16.04，一直提示已经是最新版，因此只好采用手动升级，具体步骤如下：

Step 1 : Remove the currently installed curl if installed:

sudo apt remove curl

sudo apt purge curl

Step 2 : Install the tools to compile this release and curl dependencies:

sudo apt-get update

sudo apt-get install -y libssl-dev autoconf libtool make

Step 3 : Download and install the latest release from http://curl.haxx.se/download.html. Run this commands one by one in ssh terminal:

cd /usr/local/src

rm -rf curl*

wget https://curl.haxx.se/download/curl-7.70.0.zip

unzip curl-7.70.0.zip

Compile : cd curl-7.70.0     #选择对应的版本号#

./buildconf

./configure --with-ssl

make

make install

Step 4 : Update the system’s binaries and symbol lookup (which libcurl your curl loads):

mv /usr/bin/curl /usr/bin/curl.bak

cp /usr/local/bin/curl /usr/bin/curl

完成后可通过 curl -V 查看版本