How to Free Up Disk Space on a Ubuntu Linux System and Docker¶

As you use your Ubuntu Linux system, you may find that you are running out of disk space. This can be caused by a variety of factors, such as installing new programs, downloading large files, or simply using your system over time. In this tutorial, we will go over several methods that you can use to free up disk space on your Ubuntu system, as well as how to free up space in Docker if you are using it. By following these steps, you can reclaim valuable disk space and improve the performance of your system.

Freeing Up Disk Space on a Ubuntu Linux System¶

Remove unnecessary files and directories. One of the easiest ways to free up disk space on a Ubuntu system is to remove files and directories that you no longer need. You can use the rm command to delete files and the rmdir command to delete directories. Make sure to be careful when using these commands, as deleted files and directories cannot be recovered.
Uninstall unnecessary programs. If you have programs on your system that you no longer use, you can uninstall them to free up disk space. To do this, you can use the apt-get command:
```
sudo apt-get remove program_name
```
Clear the package manager cache. The package manager cache stores the packages that you have installed on your system. These packages take up a lot of space, and you can free up this space by clearing the cache. To do this, you can use the apt-get autoclean command:
```
sudo apt-get autoclean
```
Remove old kernels. As you install updates to your system, old kernels are kept on your system in case you need to revert to an older version. However, these kernels take up a lot of space, and you can remove them to free up disk space. To do this, you can use the apt-get command:
```
sudo apt-get autoremove
```
Use the du command to find large directories. The du command allows you to see how much space is being used by each directory on your system. You can use this command to find large directories and delete the files within them to free up space. For example:
```
du -h --max-depth=1 /path/to/directory
```
Use the df command to see the available disk space. The df command allows you to see the amount of available disk space on your system. You can use this command to see how much space you have available and how much you have used.
Remove Snap packages. If you are using Snap packages, you can remove them to free up space. To do this, you can use the snap remove command:
```
snap remove package_name
```
Clean up the system journal. The journalctl utility allows you to view and manage the system journal, which stores log data for the system and system services. You can use the journalctl --vacuum-time=3d command to remove old entries from the journal that are older than 3 days and free up disk space.

Freeing Up Space in Docker¶

If you are using Docker, there are a few ways you can free up space:

Remove stopped containers: You can use the docker rm command to remove stopped containers.
Remove unused images: You can use the docker image prune command to remove unused images.
Remove unused volumes: You can use the docker volume prune command to remove unused volumes.
Remove all unused objects: You can use the docker system prune command to remove all unused objects, including stopped containers, unused images, and unused networks.