Linux: Troubleshooting \"No Space Left on Device\" Error

Recently, I encountered a perplexing issue on my Linux Ubuntu server. To investigate the problem, I accessed the server and checked the Apache error log located in /var/apache2/error.log. To my dismay, the log was inundated with numerous instances of the dreaded “No space left on device” error. Apprehension set in as I pondered how this could have happened. To get a better understanding of the situation, I decided to run the df command, which confirmed my suspicions - the disk was completely full....