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Check and verify the space in the root partition using the following command:
df -h
Mount the root partition with /mnt:
mount -o bind / /mnt
Change the directory to /mnt:
cd /mnt
Run the following command to check what is utilizing more space in /mnt:
du --max-depth=3 -xh /mnt | sort -hr | head -n 20
Analyze the directory and the content occupying a larger space.
Take a backup or copy content using the following rsync command:
rsync -a --progress /<source_directory> /<destination_directory>
Replace /<source_directory>, /<destination_directory> with the actual source and destination directory without the <,> symbols
Remove the content of the source directory using the following command. This will free up space occupied by larger directories present in the / partition.
rm -rf <source_directory>/*
Check again for the space available in the root partition.
df -h
Finally, when there is a sufficient amount of space available in the root partition, unmount the root partition from /mnt:
cd ~
umount /mnt
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