I could not log into my laptop (running on Ubuntu) yesterday. Every time I entered my password — a password I haven’t changed in years — I was returned to the same login screen all over again! But I could log into a console by pressing CTRL+ALT+F1, so it was definitely not a typo-in-the-password error. Since I always have a second user account on my PCs, it was also easy for me to verify that I could log in (in desktop/graphical mode) as a different user without any difficulty.
You know how to turn compression on for one or more web pages with PHP, but what if you want to enable compression for your entire web site?