AWS EC2 - No Space Left on Device

You have exhausted all of the inodes available on your filesystem. You likely have a directory somewhere with a metric crap-ton of tiny files. You'll need to locate that directory and remove some of the files.

To search which folder of your server is eating the inode limit, you can run this command:

find . -xdev -type f | cut -d "/" -f 2 | sort | uniq -c | sort -nr

Command taken from here

This error occurred to me while trying to install ubuntu-desktop as instructed by AWS knowledge-center.

Then I found here how to find all those directories with huge number of tiny files:

for i in /*; do count=`sudo find $i | wc -l`; if [ $count -gt 10000 ]; then echo $i $count; fi; done

/lib 18982
/proc 35223
/sys 36490
/usr 253941
/var 14584

Run it again for each suspicious sub-directory (for me it was hidden under /usr/*).

But before you remove those sub-directories with rm -rf (if you're absolutely sure!), try to safely remove Linux packages that were installed by other packages, but are no longer needed:

sudo apt-get -f install
sudo apt-get autoremove

Run df -i again to see if you have more space now.