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Fixing “111: Connection Refused” Error When Installing Packages on Ubuntu

Ubuntu 19

In this article, we’ll delve into the “111: Connection Refused” error that you may encounter when installing packages on Ubuntu. This error typically indicates that the connection to the package repository is being refused. We’ll explore possible solutions and provide detailed steps on how to implement them.

Understanding the “111: Connection Refused” Error

The “111: Connection Refused” error often arises when you’re trying to install packages using the sudo apt-get install command on Ubuntu 14.04.1 LTS or newer versions. This error message is a clear indication that your connection to the package repository is being refused. This could be due to a variety of reasons such as incorrect proxy settings, firewall restrictions, or network configurations.

Troubleshooting Steps

1. Check Proxy Settings

Ubuntu uses the /etc/apt/apt.conf or /etc/apt/apt/apt.conf.d files to store proxy settings. If these settings are incorrect, they could be causing the connection refusal.

To check these settings, open the terminal and type the following command:

cat /etc/apt/apt.conf

or

cat /etc/apt/apt/apt.conf.d

If you see lines beginning with Acquire::http::Proxy or Acquire::https::Proxy, these are your proxy settings. If you suspect they’re causing the issue, you can comment them out by adding a # at the beginning of the line.

2. Remove Proxy Settings from Network System Settings

If you’ve previously set up a proxy through Ubuntu’s network settings, this could also be causing the issue. To remove these settings, navigate to System Settings > Network > Network Proxy and set the method to None.

3. Verify Firewall and Network Configurations

Firewall rules or network configurations could be blocking the connection to the package repository. You can check your firewall settings using the ufw status command in the terminal. If you see any rules that could be causing the issue, you can remove them using the ufw delete [rule number] command.

4. Check for Interference with WSL or Third-Party Antivirus/Firewalls

If you’re using WSL (Windows Subsystem for Linux), third-party antivirus software or firewalls could be interfering with your connection. Try disabling these temporarily to see if the issue is resolved.

5. Ensure Correct IP Address and Open Port

Make sure that the correct IP address is being used and that the desired port is open on the server. You can use the ping command to verify the IP address and the telnet command to check the port.

6. Check the /etc/hosts File

If you’ve made manual entries in the /etc/hosts file, these could be causing conflicts. Open the file using the nano /etc/hosts command and remove any entries that could be causing the issue.

Conclusion

The “111: Connection Refused” error when installing packages on Ubuntu can be frustrating, but it’s usually a result of network or firewall settings that can be adjusted. By following the troubleshooting steps outlined in this article, you should be able to resolve the issue and continue with your package installation. As always, ensure to back up any important data before making significant changes to your system settings.

What is the purpose of the “/etc/apt/apt.conf” or “/etc/apt/apt/apt.conf.d” files?

The "/etc/apt/apt.conf" or "/etc/apt/apt/apt.conf.d" files are used by Ubuntu to store proxy settings for package installation. These settings determine how the system connects to the package repository.

How can I check my proxy settings?

To check your proxy settings, open the terminal and type the command "cat /etc/apt/apt.conf" or "cat /etc/apt/apt/apt.conf.d". Look for lines starting with "Acquire::http::Proxy" or "Acquire::https::Proxy", which indicate your proxy settings.

How can I remove proxy settings from Ubuntu’s network system settings?

To remove proxy settings from Ubuntu’s network system settings, navigate to "System Settings > Network > Network Proxy" and set the method to "None". This will disable any proxy configurations that may be causing the connection refusal.

How can I check my firewall settings?

To check your firewall settings, use the command "ufw status" in the terminal. This will display the current firewall rules. If any rules are blocking the connection to the package repository, you can remove them using the "ufw delete [rule number]" command.

What should I do if I suspect interference from WSL or third-party antivirus/firewalls?

If you suspect interference from WSL or third-party antivirus/firewalls, try temporarily disabling them to see if the issue is resolved. This will help determine if they are causing the connection refusal.

How can I verify the IP address and open port?

To verify the IP address, you can use the "ping" command followed by the server’s IP address. To check if a specific port is open, you can use the "telnet" command followed by the server’s IP address and the desired port number.

How can I edit the “/etc/hosts” file?

To edit the "/etc/hosts" file, open the terminal and use the command "nano /etc/hosts". This will open the file in the nano text editor. Remove any entries that could be causing conflicts with the package installation.

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