when I loged In and check "System Monitor" I can see a 1.5GB Cache in RAM.

only System monitor is running and I get this amount of cache.

I've tried:

sudo sync; echo 3 > /proc/sys/vm/drop_caches

I get response of

bash: /proc/sys/vm/drop_caches: Permission denied

How can I clear out the Cache in the RAM. is this possible?

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