I remember that actually I encountered it once with a power supply problem, but it appeared along with other random issues, like restarts, application crashes, and nvidia-smi not responding.
I would ask whether you realize you're on a linux community, but you referred to a man page as a wiki article so you are clearly lost.
The first paragraph past the link is a summary of the function of the program.
fstrim is used on a mounted filesystem to discard (or "trim") blocks which are not in use by the filesystem. This is useful for solid-state drives (SSDs) and thinly-provisioned storage.
Linux 5.12 rc1 had a bug that wiped mounted file systems. 3.13 was the kernel used in a picture of a computer running Ubuntu 14 on the International space station.
I legitimately credit Compiz and CCSM for kick-starting my obsession with FOSS and probably doubling or more my salary by getting me on Linux earlier in life.
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