The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu lunar Release' does not have a Release file-DPDK中文网

The error message “does not have a Release file” indicates that the repository you are trying to access does not have the expected files or is not set up correctly. This often happens if you’re using an outdated or unsupported version of Ubuntu.

Here are steps to resolve this issue:

Check Your Ubuntu Version: First, make sure you are using a supported version of Ubuntu. You can check your version with:
```
lsb_release -a
```
Update the Repository List: Depending on your Ubuntu version, some repositories may not be available anymore, especially if they are older versions (e.g., non-LTS versions). To find appropriate repositories for your current version, visit Ubuntu’s official releases page.

Change Software Sources: If you’re running an unsupported version, consider changing to a supported release or updating your sources list:

Open your sources list for editing:
```
sudo nano /etc/apt/sources.list
```

Replace all occurrences of your current release name (like lunar) with a supported release name such as focal (20.04 LTS) or jammy (22.04 LTS). Here’s an example for the focal release:

deb http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse

Save Changes and Update: After editing the file, save it and run the following commands to update your package lists:
```
sudo apt update
```
Install NFS Server Packages Again: Once you’ve updated your sources successfully, try installing the required packages again:
```
sudo apt install nfs-kernel-server rpcbind 
```
Consider Upgrading Your Distribution: If you’re on an outdated distribution that’s no longer receiving updates, consider upgrading to a newer LTS release of Ubuntu which has more support.

After following these steps, you should be able to resolve issues related to missing Release files and install necessary packages without errors.

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