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+[#]: subject: "How to Update or Upgrade Ubuntu Offline without Internet"
+[#]: via: "https://www.debugpoint.com/how-to-update-or-upgrade-ubuntu-offline-without-internet/"
+[#]: author: "Arindam https://www.debugpoint.com/author/admin1/"
+[#]: collector: "lkxed"
+[#]: translator: " "
+[#]: reviewer: " "
+[#]: publisher: " "
+[#]: url: " "
+
+How to Update or Upgrade Ubuntu Offline without Internet
+======
+
+**This guide explains the steps to update Ubuntu offline without an active internet connection.**
+
+There are many situations where you may need to update your Ubuntu installation without an internet connection. You may be staying remotely or have a set of network Ubuntu systems that are not connected to the internet. In any case, keeping your system updated with the latest packages is always required.
+
+Of course, updating any system while connected to the internet is always recommended.
+
+But sometimes, it is not possible for security reasons also. Connecting to the internet may bring additional hardening steps for your systems to protect them from hackers and malware.
+
+The following method using [apt-offline][1] helps to fix those use cases and outlines the steps to update your Ubuntu offline without the internet.
+
+### Pre-requisite
+
+- You need to have access to a Ubuntu system that has an internet connection (e.g. your friends, cafe, or lab system)
+- A USB pen drive to hold the packages
+- Install the apt-offline package in both the systems – a) the offline system and b) the system with an internet connection.
+
+### Install apt-offline
+
+both systems
+
+You can install the `apt-offline` using the following command. Remember, you have to get it installed in .
+
+```
+sudo apt install apt-offline
+```
+
+In case you need the `apt-offline` to be installed in the target system, you can download the deb package from the below link and copy it to the target system via a USB stick. Then run the below command to install.
+
+The download link for Ubuntu 22.04 LTS and other versions is present below. You can choose a mirror and download the deb file.
+
+[download .deb files – apt-offline][2]
+
+```
+sudo dpkg -i name_of_package.deb
+```
+
+### Update Ubuntu offline: Steps
+
+Open a terminal in the offline Ubuntu system and create a signature file using the following command in your home directory.
+
+```
+sudo apt-offline set ~/offline-data.sig
+```
+
+[![Create the sig file][3]][4]
+
+This creates a file containing the required package paths and details for download.
+
+[![sig file contents][5]][6]
+
+Copy this .sig file to a USB and take it to a Ubuntu system with internet access.
+
+Create a directory (see example below) to hold the downloaded packages in the Ubuntu system with an internet connection.
+
+Open a terminal and run the following command to download the required packages. Remember to change the download directory and .sig file path as per your system.
+
+```
+apt-offline get -d ~/offline-data-dir offline-data.sig
+```
+
+[![Download the packages to install offline][7]][8]
+
+offline Ubuntu system
+
+You should see the files are downloaded properly. Now copy the entire downloaded directory to the USB drive and plug it into the .
+
+Then run the following command to install the downloaded packages to the offline system. Change the directory path as per your system.
+
+```
+sudo apt-offline install offline-data-dir/
+```
+
+[![Installing packages - offline update ubuntu][9]][10]
+
+The update should run smoothly if all goes well, and you should have an updated Ubuntu system.
+
+You must repeat the steps above to keep your Ubuntu system up-to-date offline whenever you need to update.
+
+I hope this guide helps you to update your Ubuntu system in an offline mode. If you face any trouble, let me know in the comment box below.
+
+--------------------------------------------------------------------------------
+
+via: https://www.debugpoint.com/how-to-update-or-upgrade-ubuntu-offline-without-internet/
+
+作者：[Arindam][a]
+选题：[lkxed][b]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://www.debugpoint.com/author/admin1/
+[b]: https://github.com/lkxed
+[1]: https://github.com/rickysarraf/apt-offline
+[2]: https://packages.ubuntu.com/focal/all/apt-offline/download
+[3]: https://www.debugpoint.com/wp-content/uploads/2021/03/Create-the-sig-file-1024x204.jpg
+[4]: https://www.debugpoint.com/wp-content/uploads/2021/03/Create-the-sig-file.jpg
+[5]: https://www.debugpoint.com/wp-content/uploads/2021/03/sig-file-contents-1024x250.jpg
+[6]: https://www.debugpoint.com/wp-content/uploads/2021/03/sig-file-contents.jpg
+[7]: https://www.debugpoint.com/wp-content/uploads/2021/03/Download-the-packages-to-install-offline-1024x437.jpg
+[8]: https://www.debugpoint.com/wp-content/uploads/2021/03/Download-the-packages-to-install-offline.jpg
+[9]: https://www.debugpoint.com/wp-content/uploads/2021/03/Installing-packages-offline-update-ubuntu-1024x509.jpg
+[10]: https://www.debugpoint.com/wp-content/uploads/2021/03/Installing-packages-offline-update-ubuntu.jpg