--2023-06-07 23:20:07-- https://www.openvswitch.org/releases/openvswitch-2.5.0.tar.gz Resolving www.openvswitch.org (www.openvswitch.org)... 185.199.109.153, 185.199.108.153, 185.199.110.153, ... Connecting to www.openvswitch.org (www.openvswitch.org)|185.199.109.153|:443... connected. ERROR: cannot verify www.openvswitch.org's certificate, issued by \u2018/C=US/O=Let's Encrypt/CN=R3\u2019: Issued certificate has expired. To connect to www.openvswitch.org insecurely, use `--no-check-certificate'.

这是一个关于下载OpenvSwitch的命令行输出，但是在连接到OpenvSwitch的网站时发生了一个证书错误。由于证书已过期，所以无法进行安全连接。如果你仍想不安全地连接到该网站，可以使用`--no-check-certificate`参数。但是，我建议你等待OpenvSwitch网站更新其证书。

相关问题

ovs-appctl: cannot read pidfile "/var/run/openvswitch/ovs-vswitch.pid" (No such file or directory)

这个错误通常是由于 Open vSwitch 管理守护进程（ovs-vswitchd）没有运行导致的。你可以尝试手动启动 ovs-vswitchd 服务来解决此问题。可以使用以下命令启动服务：

sudo service openvswitch-switch start

如果服务已经在运行，则尝试重新启动服务：

sudo service openvswitch-switch restart

如果上述命令无法解决问题，请检查是否正确安装了 Open vSwitch，并确保在运行命令之前以 root 用户身份运行它们。

解释 openvswitch-pki openvswitch-testcontroller E: Sub-process /usr/bin/dpkg returned an error code (1)

1. Openvswitch-pki: Openvswitch-pki is a utility that is used to generate and manage SSL certificates and keys for Openvswitch. SSL certificates are used in secure communication between different components of Openvswitch. Openvswitch-pki is used to generate and manage these certificates.

2. Openvswitch-testcontroller: Openvswitch-testcontroller is a component of Openvswitch that is used for testing purposes. It is used to simulate OpenFlow switches and to test the functionality of Openvswitch.

3. E: Sub-process /usr/bin/dpkg returned an error code (1): This error message is generated by the Debian package management system (dpkg) when it encounters an error during the installation or removal of a package. The error code (1) indicates a generic error, and the specific cause of the error may vary depending on the package being installed or removed. Common causes of this error include missing dependencies, conflicts with other packages, or file system errors.