Ubuntu Error: the system network service is not compatible with this version

本文解决了一个因手动配置Ubuntu 12.04的IP及DNS而导致的网络问题。通过恢复/etc/network/interfaces文件并重启network-manager服务,成功解决了系统网络服务不兼容的问题。

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之前在尝试手动设置ubuntu 12.04的ip和dns的时候,修改了部分的文件,导致今天重新启动ubuntu的时候,网卡起不来,打开网络设置工具,报错如下:

the system network service is not compatible with this version


解决方案:之前修改了文件 /etc/network/interfaces 把里面的内容都删掉了

auto lo
iface lo inet loopback
恢复interfaces文件如上内容

然后启动network manage 服务:sudo service network-manager start

参考资料:

1、http://askubuntu.com/questions/129436/restarted-computer-during-update-the-system-network-service-is-not-compatible

2、http://askubuntu.com/questions/220377/why-doesnt-network-manager-start-at-boot

### Ubuntu SSH Connection Refused Network Error Solution When encountering an issue where SSH connections are being refused on an Ubuntu system, several potential causes and solutions can be explored. A common reason for this problem is that the OpenSSH server might not be installed or could have stopped functioning properly. To verify whether the SSH service is active, one should check its status using `systemctl`: ```bash sudo systemctl status ssh ``` If the service appears inactive, restarting it may resolve connectivity issues[^1]: ```bash sudo systemctl restart ssh ``` Another critical aspect involves ensuring firewall settings do not block incoming SSH requests. By default, UFW (Uncomplicated Firewall), which comes pre-installed with many Linux distributions including Ubuntu, blocks all inbound traffic unless explicitly allowed. To permit SSH access through port 22, execute these commands: ```bash sudo ufw allow ssh sudo ufw reload ``` Additionally, verifying configuration files within `/etc/ssh/sshd_config` ensures no misconfigurations exist preventing proper operation of the SSH daemon. Common adjustments include setting `PermitRootLogin`, adjusting `PasswordAuthentication`, and confirming correct listening addresses under `ListenAddress`. Lastly, examining logs located at `/var/log/auth.log` provides insight into any authentication failures or other errors related to attempted SSH sessions. This diagnostic step helps pinpoint specific reasons behind denied connections.
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