A few years ago I installed CentOS (because it was supposed to be one of the most stable distros at the time) and my mom was happy using LibreOffice to make her documents. I taught her how to update the system and everything was well until one day she told me she could not update the system because the update program was gone. I thought the shortcut was misplaced or something, but actually CentOS had a bug where the graphical update utility uninstalled itself with one of the updates. I wonder how computer illiterate people are supposed to fix something like this without assistance :)