The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/fce659099515323f8a61f08c76744911.gif" -- '\Large \begin{aligned}|x+y| = -x-y \leq x-y = |x|+|y|\end{aligned}'
returned status = 126
Image not found!
Please try the debugging script