Linux

It sounds like you don't have the GD extension installed. I don't use Ubuntu any longer, but I think it may be named php5-gd,...

Command line interface for testing internet bandwidth using speedtest.net How to check Internet Speed via Terminal?

ls-command: how to display the file size? ls -lah -l use a long listing format -a, --all do not hide entries starting with. -h --human-readable When used with the -l...